The Ultimate Creamy & Cheesy HashBrown Casserole Recipe

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HashBrown Casserole

There are certain dishes that instantly transport you back to holidays, church potlucks, or Sunday family dinners. Chief among them is the glorious, deeply comforting, and utterly indispensable HashBrown Casserole. Known affectionately across the Midwest and the South as “Funeral Potatoes,” this dish is anything but mournful. It is a celebration of creamy textures, sharp cheddar, and crispy edges, all built around humble frozen shredded potatoes.

If you are searching for a foolproof, crowd-pleasing side dish one that requires minimal effort but delivers maximum flavor you have found your holy grail. This recipe takes the classic HashBrown Casserole formula and perfects it, ensuring a rich, non-soggy center and a golden, crunchy topping that provides the perfect textural contrast. Whether you are prepping for a festive holiday like Thanksgiving, hosting a casual brunch, or simply craving the ultimate comfort food, this cheesy potato bake will earn you rave reviews. Get ready to dive into the simple magic of the perfect, creamy, and flavorful HashBrown Casserole.

Why You’ll Absolutely Love This Creamy HashBrown Casserole Recipe

This isn’t just another potato side dish; this is a culinary institution. The reason the classic HashBrown Casserole remains a staple across generations is its irresistible combination of simplicity and decadent flavor. You will love this specific rendition because it elevates the standard recipe while maintaining its easy-to-make nature.

Unbeatable Comfort Food Status

In the world of side dishes, the HashBrown Casserole reigns supreme as the ultimate comfort food. It’s warm, hearty, and packed with the deep savory flavor of cheese and cream. Unlike French fries or mashed potatoes, this casserole offers a complex texture the soft, creamy interior contrasts beautifully with the slight chewiness of the potatoes and the crispy topping. It’s the kind of dish that hugs you from the inside out, making any meal feel special, regardless of the occasion. This recipe, in particular, achieves that perfect balance where the potatoes are fully cooked and tender without turning into a mushy paste, a common pitfall in less successful versions.

Effortless Preparation and Minimal Stress

One of the major advantages of using frozen shredded hashbrowns is the sheer convenience. There is no peeling, chopping, or boiling involved. The prep work for this entire dish can be completed in less than 15 minutes. All you need is a large bowl, a whisk, and a spatula. This is a game-changer when you are managing a large holiday meal (like Thanksgiving or Christmas) and every minute counts. The simple dump-and-stir process means even novice cooks can achieve a professional-quality result. Plus, the forgiving nature of the HashBrown Casserole allows you to mix everything ahead of time (we’ll cover those make-ahead tips later!) and simply pop it in the oven when you are ready to bake.

Perfectly Customizable Flavor Profile

While the classic version is undeniably delicious, this HashBrown Casserole recipe provides a fantastic foundation for flavor experimentation. You can easily modify the cheese, the cream soup, and the topping to suit your preferences or the main dish you are serving. Love a bit of spice? Add a dash of hot sauce or diced jalapeños. Serving ham? Toss in some crispy bacon bits or smoked paprika. The versatility ensures this recipe never gets boring and can be tailored to match anything from a simple weeknight roast chicken to a magnificent holiday feast. The addition of freshly chopped onion, though optional, elevates the savory depth dramatically, moving it beyond a standard “four-ingredient” dish.

The Critical Crunchy Topping

Perhaps the most common complaint about potato casseroles is the lack of texture on top. We solve that definitively here. The recipe specifically calls for reserving cheese and adding a crunchy layer (crushed cornflakes, Ritz crackers, or potato chips) in the last stage of baking. This two-step topping process ensures that the cheese melts beautifully and adheres to the crunchy layer, creating a golden, satisfyingly crisp crust that provides that essential textural counterpoint to the creamy interior. This attention to detail guarantees every bite of the HashBrown Casserole is balanced and delightful.

Why You Should Try This HashBrown Casserole Today

If this dish isn’t already in your regular rotation, it’s time to fix that. Beyond being delicious, the HashBrown Casserole offers significant practical benefits that make it an indispensable asset in any home kitchen, especially when planning meals for large groups or busy weeks. This isn’t just about taste; it’s about culinary strategy.

The Ultimate Make-Ahead Marvel

For cooks who value efficiency and stress-free entertaining, the ability to prep dishes ahead of time is invaluable. This creamy HashBrown Casserole is the perfect make-ahead candidate. You can assemble the entire dish (Steps 1 through 3), cover the baking dish tightly, and refrigerate it for up to 24 hours. When you are ready to serve, just let it sit on the counter for 30 minutes to take the chill off, then proceed with the baking instructions (you might need an extra 5-10 minutes of baking time if it is very cold). This allows you to focus on the more time-sensitive aspects of your meal, like roasting the turkey or timing the gravy, knowing your side dish is ready to go.

Economical and Feeds a Crowd

Cooking for a large family or a big party doesn’t have to break the bank. The ingredients for this HashBrown Casserole primarily potatoes, cream soup, and sour cream are incredibly budget-friendly. This single 9×13 inch recipe easily yields 12 servings, making it an extremely economical choice for potlucks, church gatherings, or large family dinners. It’s hearty enough to be the centerpiece of a brunch (perhaps alongside some savory sausage) or a foundational side dish for a robust supper.

A Guaranteed Hit for Picky Eaters

Let’s be honest: sometimes introducing new dishes to the family can be challenging. The beauty of this cheesy HashBrown Casserole lies in its universal appeal. It contains familiar, comforting flavors potatoes, cheese, and a creamy sauce that even the pickiest eaters rarely turn down. It’s an easy way to ensure everyone at the table has something satisfying to enjoy. It is also a fantastic alternative to traditional side dishes like mashed potatoes, offering the same comfort with a richer, more complex texture. If you’re looking for other easy, crowd-pleasing sides, consider pairing this with a comforting dish like our Creamy Chicken and Stuffing Casserole, or perhaps a hearty bowl of Crockpot Potato Soup for a soup and side night.

Perfect for Every Season and Occasion

While often associated with Thanksgiving and Christmas, the HashBrown Casserole is versatile enough for year-round enjoyment. Serve it alongside barbecue in the summer, with chili in the fall, or as a decadent brunch item on Easter morning. Its robust flavor profile holds up well against both rich meats and lighter fare. It truly is the Swiss Army Knife of side dishes.

Ingredients and Utensils: Mastering the Perfect HashBrown Casserole

The success of the classic, creamy, and crunchy HashBrown Casserole hinges entirely on high-quality ingredients and a few simple preparation steps. Here is a detailed breakdown of everything you need to assemble this magnificent dish, ensuring you achieve that desired non-soggy, deeply flavorful result.

The Essential Components of Your HashBrown Casserole

Achieving the perfect texture starts with proper selection and preparation of the main ingredients. Note the specific quantities required for a standard 9×13 inch casserole pan:

Item Quantity Notes for Success
Hashbrowns 1 (30-32 ounce) bag Frozen shredded hashbrowns. Must be completely thawed and drained. This is non-negotiable for avoiding a watery casserole.
Cream Soup 1 (10.5 ounce) can Cream of Chicken Soup is traditional and adds savory depth. Cream of Mushroom or Cream of Celery are excellent substitutes.
Sour Cream 1 (16 ounce) container Full-fat sour cream provides the richest texture and tanginess, balancing the sweetness of the cream soup.
Cheddar Cheese 2 cups Sharp cheddar cheese, shredded. Divide this quantity: 1 1/2 cups for the filling, 1/2 cup reserved for the topping. Shredding your own cheese melts better than pre-shredded.
Butter (For Filling) 1/2 cup (1 stick) Unsalted butter, melted. Butter is essential for flavor and richness, coating the potatoes and preventing sticking.
Onion 1/2 medium Finely chopped yellow onion. Highly recommended for flavor, but optional. If skipping, substitute with 1 teaspoon of onion powder.
Seasoning 1 teaspoon Salt, 1/2 teaspoon Black Pepper Adjust to taste. Freshly ground black pepper is always preferred.
Optional Topping 1 cup Crushed cornflakes, buttered Ritz crackers, or crushed potato chips (like plain Ruffles). This creates the ultimate crispy crust.
Topping Butter 2 tablespoons Melted, used specifically for tossing with the crunchy topping ingredient.

The Importance of Thawed and Drained Hashbrowns

We cannot stress this enough: for a non-soggy HashBrown Casserole, you must eliminate excess moisture. Frozen hashbrowns hold a significant amount of ice and water. Thaw them overnight in the refrigerator, or rapidly by spreading them on a baking sheet at room temperature for an hour. Once thawed, transfer them to a clean kitchen towel or several layers of sturdy paper towels and squeeze gently but firmly. Removing this moisture is the single most important step in achieving a firm, creamy, and structurally sound casserole.

Dairy Choices for Maximum Creaminess

  • Sour Cream vs. Cream Cheese: While sour cream provides the traditional tangy flavor and creamy texture, some bakers prefer substituting half the sour cream with softened cream cheese for an extra dense and rich HashBrown Casserole. Both deliver exceptional results, but sour cream is generally easier to mix into the base.
  • The Cheese Factor: Using Sharp Cheddar Cheese is highly recommended. The bold flavor cuts through the richness of the cream soup and sour cream. Pre-shredded cheese contains anti-caking agents that can hinder smooth melting; if possible, grate a block of cheddar for superior gooey results.

Necessary Tools for Your HashBrown Casserole

You don’t need specialty equipment for this dish, but having the right basics ensures efficiency:

  1. 9×13 Inch Baking Dish (Casserole Pan): The standard size for this recipe. Ensure it is lightly greased to prevent sticking.
  2. Large Mixing Bowl: Essential for combining the creamy base and then gently folding in the delicate hashbrowns without breaking them up.
  3. Whisk: Used to smoothly combine the sour cream, soup, melted butter, and seasonings for the creamy foundation.
  4. Sturdy Spatula or Wooden Spoon: Crucial for the mixing step. You need to fold the potatoes into the creamy mixture gently. Avoid mixing aggressively, which can turn the hashbrowns into sticky mashed potatoes.
  5. Measuring Cups and Spoons: For accurate ingredient quantities, especially the salt and pepper.
  6. Kitchen Towel or Paper Towels: Absolutely necessary for draining the thawed hashbrowns.

Detailed Recipe Steps: Baking the Perfect HashBrown Casserole

Follow these detailed instructions precisely to ensure a flawless, golden, and incredibly delicious HashBrown Casserole every time.

Step 1: Preparation is Key

  1. Preheat the Oven: Set your oven temperature to 350°F (175°C). This moderate temperature allows the casserole to cook through evenly without burning the edges before the center is set.
  2. Grease the Pan: Lightly grease a standard 9×13 inch baking dish. Use butter, cooking spray, or shortening to prevent the cheesy edges from sticking.
  3. The Critical Thaw and Drain: Ensure your bag of frozen shredded hashbrowns is completely thawed. Lay the thawed hashbrowns out on a clean, absorbent kitchen towel. Gather the edges of the towel and gently but firmly squeeze out the excess liquid. This step is the difference between a delightful HashBrown Casserole and a watery potato soup.

Step 2: Combine the Creamy Base

This is where the flavor magic happens. We build the rich, savory coating that binds the potatoes together.

  1. In your large mixing bowl, combine the entire can of cream soup (Cream of Chicken or Mushroom), the full container of sour cream, the 1/2 cup of melted butter, the finely chopped onion (if using), the teaspoon of salt, and the half-teaspoon of black pepper.
  2. Whisk vigorously until the mixture is entirely smooth and uniform. You don’t want lumps of sour cream or unincorporated soup.
  3. Add the Cheese: Stir in 1 1/2 cups of the shredded cheddar cheese into the creamy mixture. Mix until the cheese is just incorporated. Reserve the remaining 1/2 cup of cheese for the final topping stage.

Step 3: Mix and Transfer

The key here is gentle handling to maintain the integrity of the potato shreds.

  1. Add the thawed and drained hashbrowns directly into the mixing bowl containing the creamy cheese base.
  2. Gently Fold: Using a spatula or wooden spoon, gently fold the hashbrowns into the mixture. Start from the bottom and fold over. Repeat until all the hashbrowns are evenly coated in the creamy sauce. Avoid mashing or stirring too aggressively; we want distinct shredded potatoes, not a paste.
  3. Pour the entire HashBrown Casserole mixture into the prepared 9×13 inch baking dish. Spread it out evenly, reaching all corners.

Step 4: Initial Baking (The Setting Stage)

The first stage of baking allows the internal structure to set and ensures the potatoes cook fully before the topping is added.

  1. Place the casserole in the preheated 350°F (175°C) oven.
  2. Bake for exactly 30 minutes. The edges will just begin to bubble, and the top will start to look dry.

Step 5: Add Topping (The Crispy Crust Secret)

While the casserole is baking, prepare your crunchy topping so it’s ready to go.

  1. Prepare the Crunch: In a small bowl, combine your choice of topping (1 cup crushed cornflakes, Ritz crackers, or chips) with the 2 tablespoons of melted butter. Toss gently until the crumbs are evenly coated. For extra flavor, sprinkle a pinch of paprika into the cornflakes.
  2. After the 30 minutes of initial baking, carefully remove the HashBrown Casserole from the oven.
  3. Layer the Topping: First, sprinkle the reserved 1/2 cup of cheddar cheese evenly over the partially baked casserole. Second, spread the prepared crunchy topping mixture over the cheese layer.

Step 6: Finish Baking and Rest

The final bake is crucial for achieving that perfect golden color and melted cheese.

  1. Return the casserole to the oven and continue baking for another 15 to 20 minutes.
  2. Check for Doneness: The HashBrown Casserole is ready when it is bubbly all the way through, the cheese is fully melted underneath the crust, and the topping has turned a rich, golden brown color.
  3. The Essential Rest: Remove the finished casserole from the oven and let it rest on a cooling rack for 10 minutes before serving. Do not skip this step! Resting allows the creamy sauce to set up fully, preventing a messy scoop and ensuring the slices hold their shape beautifully.

Tips and Variations for HashBrown Casserole Perfection

While the traditional recipe is flawless, there are countless ways to customize and enhance your HashBrown Casserole to meet specific dietary needs or flavor preferences. Here are our top tips and ingredient variations.

Common Mistakes to Avoid

  1. Soggy Potatoes: As emphasized, the primary enemy of a good casserole is excess moisture. Always thaw and drain your hashbrowns completely. If you are short on time, you can briefly blot the frozen hashbrowns with paper towels, but a full thaw-and-squeeze is better.
  2. Lack of Seasoning: Cream soups and sour cream are rich but can be bland without proper seasoning. Do not skimp on salt and pepper. Consider adding a touch of garlic powder or a pinch of dry mustard powder to amp up the savory notes of the cheese.
  3. Insufficient Cooking Time: If the casserole is removed too early, the center will be runny. If you notice the topping browning too quickly, loosely tent the dish with foil for the final 10 minutes of baking.

Fantastic Flavor and Ingredient Variations

The Creamy Base Alternatives

  • Cream-Soup Free (Gluten-Free): If you want to avoid canned soup or need a gluten-free HashBrown Casserole, you can make a simple Bechamel (white sauce) substitute. Whisk 3 tablespoons of melted butter with 3 tablespoons of rice flour (for GF) or all-purpose flour. Cook for one minute, then gradually whisk in 1 1/2 cups of milk or broth until thickened. Use this creamy mixture in place of the canned soup.
  • Using Cream Cheese: For an ultra-rich texture, replace half (8 ounces) of the sour cream with 8 ounces of softened cream cheese. This results in a thicker, denser HashBrown Casserole.
  • Yogurt Substitute: You can substitute Greek yogurt for sour cream for a slightly tangier and protein-boosted casserole, though the full-fat sour cream provides the best texture.

Protein and Vegetable Add-Ins

Turn this side dish into a main course by folding in cooked proteins:

  • Breakfast Casserole Style: Add 1 cup of fully cooked, crumbled bacon, or diced breakfast sausage.
  • Ham and Cheese: Fold in 1 1/2 cups of diced cooked ham for a savory dinner classic, often associated with holiday leftovers.
  • Vegetable Boost: Sautéed bell peppers, canned drained green chilies, or steamed broccoli florets are excellent additions to increase color and nutritional value. For a similar green side dish, check out our popular Green Bean Casserole with Cream Cheese.

Topping Innovations

While cornflakes are classic, don’t limit yourself:

  • Buttered Panko Breadcrumbs: These provide a fine, incredibly crunchy crust that holds up well. Toss panko with butter and a pinch of Parmesan cheese.
  • Sautéed Onion Crunch: For a more savory topping, use fried onion pieces (like French’s Fried Onions).
  • The Cracker Choice: Ritz crackers are butterier and melt more delicately, while saltines offer a sharper crunch. Choose based on your textural preference.

Make-Ahead and Freezing Instructions

To prepare this cheesy HashBrown Casserole ahead of time:

  • Refrigeration: Assemble the casserole completely (Steps 1-3) but do not add the topping yet. Cover tightly with plastic wrap and aluminum foil. Refrigerate for up to 24 hours. When ready to bake, remove the foil/wrap, let stand 30 minutes, add the topping, and bake as directed (you may need an extra 10-15 minutes).
  • Freezing (Unbaked): Assemble the casserole without the topping. Wrap tightly in plastic wrap and then foil. Freeze for up to 3 months. Thaw overnight in the refrigerator before baking, then proceed with Step 5 and 6.

For more great comfort food ideas and visual inspiration, be sure to follow my recipe boards on Pinterest for delightful side dishes and casseroles!

Nutritional Values and Benefits of HashBrown Casserole

The HashBrown Casserole is undeniably rich comfort food, beloved precisely because of its high caloric and satisfying profile. While it’s certainly not a low-calorie dish, understanding its components allows you to appreciate the energy and nutrients it provides, especially when serving it as part of a balanced holiday meal.

A Note on Nutritional Breakdown

The precise nutritional value of a serving of this HashBrown Casserole will vary significantly based on the type of cream soup used (low-sodium vs. regular), whether you opt for full-fat or reduced-fat dairy, and the type of topping chosen. The estimates below are based on a full-fat dairy and standard Cream of Chicken Soup, calculated for 12 generous servings from the 9×13 inch pan.

Estimated Nutritional Values (Per Serving, 1/12th of Casserole):

  • Calories: Approximately 350–400 kcal
  • Protein: 10–12 g (Primarily from cheese and cream soup)
  • Total Fat: 25–30 g (High due to butter, sour cream, and cheese)
  • Saturated Fat: 15–18 g
  • Carbohydrates: 25–30 g (From potatoes, soup thickeners, and topping)
  • Fiber: 2–3 g
  • Sodium: 500–700 mg (Highly dependent on canned soup and added salt)

Ingredient Benefits and Power Components

The Power of Potatoes

Potatoes often get a bad rap, but they are nutritional powerhouses, even when frozen and shredded. They are an excellent source of complex carbohydrates, providing sustained energy. Importantly, potatoes are rich in:

  • Potassium: Essential for blood pressure regulation and maintaining proper nerve function.
  • Vitamin C: A valuable antioxidant that supports the immune system.
  • Vitamin B6: Plays a crucial role in metabolic processes.

Dairy Goodness: Calcium and Protein

The creamy base sour cream and cheddar cheese contributes heavily to the dish’s richness and nutritional profile:

  • Calcium: Cheese is one of the best dietary sources of calcium, vital for bone health.
  • Protein: Dairy products provide high-quality protein, which is necessary for muscle repair and satiety. The protein content helps make the HashBrown Casserole a filling and satisfying side dish.

Managing the Sodium Content

Because cream soups are often high in sodium, this is an area where conscious choice makes a big difference. If you are mindful of sodium intake, opt for low-sodium versions of the cream soup or choose the homemade Bechamel alternative mentioned in the variations section. This will allow you to control the salt added during seasoning while still enjoying the full, comforting flavor of your HashBrown Casserole.

For those looking for another hearty side that provides complex carbs and fiber, consider our recipe for Easy Crock Pot Sweet Potato Casserole.

FAQs About HashBrown Casserole (Cheesy Potatoes)

We’ve answered the most common questions about baking, storing, and serving this classic cheesy potato dish, ensuring your HashBrown Casserole turns out perfectly every time.

How do I prevent my HashBrown Casserole from being watery or soggy?

The primary cause of a watery HashBrown Casserole is excess moisture from the frozen potatoes. You must ensure the hashbrowns are completely thawed and then squeezed firmly in a clean kitchen towel to remove as much liquid as possible before mixing them into the creamy base. Also, letting the casserole rest for 10 minutes after baking allows the sauce to fully set.

Can I prepare the HashBrown Casserole the night before?

Absolutely! HashBrown Casserole is a fantastic make-ahead dish. Assemble the potatoes and the creamy filling (Steps 1-3), cover the dish tightly, and refrigerate overnight. Do not add the crunchy topping until right before the final baking stage to ensure it stays crisp.

What is the best type of cheese to use for a rich HashBrown Casserole?

Sharp cheddar cheese is highly recommended, as its strong, tangy flavor perfectly balances the richness of the creamy sauce. You can also mix cheddar with Colby Jack or Monterey Jack for superior meltiness, but always ensure you are using freshly grated cheese for the best result.

What can I use instead of Cream of Chicken soup?

If you need a substitution, Cream of Mushroom, Cream of Celery, or Cream of Onion soup all work excellently, providing the necessary binder and savory flavor. For a dairy-free or gluten-free HashBrown Casserole, you can use a homemade white sauce (Bechamel) thickened with rice flour or cornstarch instead.

How do I store and reheat leftover HashBrown Casserole?

Store leftovers tightly covered in the refrigerator for up to 3-4 days. To reheat, you can use the microwave, but for the best texture, reheat in a 300°F oven until warmed through. Covering it with foil initially prevents the top from burning while the interior heats up completely.

Conclusion: The Timeless Appeal of HashBrown Casserole

The HashBrown Casserole is more than just a side dish; it is a beloved centerpiece of comfort food culture. This recipe delivers everything you expect from the classic it is creamy, undeniably cheesy, rich with savory depth from the butter and soup, and features a spectacularly crispy topping that provides the perfect crunch.

We’ve walked through the crucial steps, from ensuring those frozen hashbrowns are properly drained (the key to avoiding a soupy disaster!) to layering on that golden, crunchy topping right before the final bake. This approach guarantees a structurally sound and intensely flavorful casserole that is ready to impress. Whether you call it cheesy potatoes, funeral potatoes, or just the best side dish ever, its role in feeding a crowd and delivering nostalgic satisfaction remains unmatched.

Embrace the simplicity and deliciousness of this potato bake. Prep it ahead for your next holiday gathering, serve it as the star of your next brunch, or simply make it tonight when you need a hearty dose of comfort. Once you master this foolproof technique, the HashBrown Casserole will certainly earn a permanent spot on your family’s favorite recipes list. Try it today, and let us know in the comments how this creamy, cheesy classic elevated your meal! Don’t forget to share this recipe with friends who need a reliable, crowd-pleasing side. If you enjoyed this savory casserole, you might also love our recipe for Campbell’s Green Bean Casserole, a Thanksgiving Classic Reimagined.

HashBrown Casserole

Classic Cheesy Hashbrown Casserole (Funeral Potatoes)

This creamy, cheesy hashbrown casserole is the ultimate comfort food, blending shredded hashbrowns, a rich sour cream sauce, and plenty of cheddar, topped with a crispy cornflake crust. It's an essential side dish for holidays and potlucks.
Prep Time 15 minutes
Cook Time 45 minutes
Total Time 1 hour
Servings: 12 servings
Course: Casserole, Side Dish
Cuisine: American, Southern
Calories: 405

Ingredients
  

Casserole Base
  • 1 bag Frozen shredded hashbrowns 30-32 ounce bag, completely thawed and excess liquid squeezed out.
  • 1 can Cream of Chicken Soup 10.5 ounce can (or Cream of Mushroom/Celery)
  • 1 container Sour Cream 16 ounce, full fat or reduced fat
  • 2 cups Sharp cheddar cheese Shredded and divided (1 1/2 cups for base, 1/2 cup for topping)
  • 1/2 cup Unsalted butter Melted (1 stick)
  • 1/2 medium Yellow onion Finely chopped (optional, substitute 1 tsp onion powder)
  • 1 teaspoon Salt
  • 1/2 teaspoon Black Pepper Freshly ground preferred
Optional Topping
  • 1 cup Crushed cornflakes Or crushed buttered Ritz crackers, or potato chips
  • 2 tablespoons Unsalted butter Melted, for tossing with optional topping

Equipment

  • 9x13 inch baking dish
  • Large Mixing Bowl

Method
 

Step 1: Preparation
  1. Preheat Oven: Preheat your oven to 350°F (175°C). Lightly grease a standard 9x13 inch baking dish.
  2. Thaw and Drain: Ensure the frozen hashbrowns are completely thawed. Gently squeeze out any excess liquid using paper towels or a clean kitchen towel; this prevents a watery casserole.
Step 2: Combine the Base
  1. Combine Creamy Ingredients: In a large mixing bowl, whisk together the canned cream soup, sour cream, 1/2 cup melted butter, chopped onion (if using), salt, and black pepper until the mixture is smooth and well combined.
  2. Add Cheese: Add 1 1/2 cups of the shredded cheddar cheese to the creamy mixture and stir to incorporate. Reserve the remaining 1/2 cup of cheese for the topping.
Step 3: Mix and Bake
  1. Mix and Transfer: Add the thawed hashbrowns to the mixing bowl. Gently fold the hashbrowns into the mixture using a spatula until the hashbrowns are evenly coated. Pour the mixture into the prepared baking dish and spread it into an even layer.
  2. Initial Bake: Place the casserole in the preheated oven and bake for 30 minutes.
Step 4: Add Topping and Finish
  1. Prepare Topping: While the casserole is baking, toss the crushed cornflakes (or chips/crackers) with 2 tablespoons of melted butter in a small bowl.
  2. Final Topping: After 30 minutes, remove the casserole from the oven. Sprinkle the reserved 1/2 cup of cheddar cheese evenly over the top, followed by the prepared crunchy topping (if using).
  3. Finish Baking and Rest: Return the casserole to the oven and continue baking for another 15 to 20 minutes, or until the casserole is bubbling hot, the cheese is fully melted, and the topping is golden brown and crisp. Remove from oven and let it rest on a cooling rack for 10 minutes before serving. This allows the casserole to set.

Notes

For a lighter casserole, use low-fat sour cream and substitute the butter with olive oil, although this will change the traditional flavor profile.
**Freezing Instructions:** This casserole can be assembled up to 24 hours ahead of time (without the crunchy topping). Cover tightly and refrigerate. When ready to bake, add 15 minutes to the initial bake time since you are starting from cold. Add the topping for the final 20 minutes of baking.

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