Cheesy Hashbrown Casserole

Name: Cheesy Hashbrown Casserole
Prep time: 15 min
Cook time: 55 min
Total time: 70 min
Yield: 12 servings
Ingredients: 30 oz (about 850 g) frozen shredded hash browns, thawed; 1 can (10.5 oz / 298 g) condensed cream of chicken soup; 2 cups (480 ml) sour cream; 1/2 cup (113 g) unsalted butter, melted (divided: 1/4 cup for the mix, 1/4 cup for the topping); 2 cups (about 225 g) shredded sharp cheddar cheese, plus 1/2 cup for the top; 1/2 cup (60 g) grated Parmesan cheese; 1 tsp onion powder; 1 tsp garlic powder; 1 tsp fine salt; 1/2 tsp black pepper; 2 cups (about 60 g) cornflakes, lightly crushed

Updated 2026-07-06 · By The Crisp & Simmer Kitchen

Cheesy hashbrown casserole with a crunchy cornflake top: creamy, cheddar-loaded frozen hash browns baked in a 9x13 for an easy potluck-ready side.

↓ Jump to Recipe A golden-topped cheesy hashbrown casserole in a white baking dish, one corner scooped out to show creamy cheddar potatoes under a crunchy cornflake crust.

A golden-topped cheesy hashbrown casserole in a white baking dish, one corner scooped out to show creamy cheddar potatoes under a crunchy cornflake crust.

Cheesy hashbrown casserole is the dish we bring when a crowd needs feeding and nobody wants to fuss. Creamy cheddar potatoes under a buttery cornflake crust, built from a bag of frozen shredded hash browns.

It comes together in one bowl, goes into a 9x13, and bakes into golden, scoopable squares. In our kitchen it earns its spot at every holiday table and weeknight potluck.

Best of all, most of it is hands-off: you mix, you spread, and the oven does the rest.

Why This Recipe Works

Three things make this version reliable, and none of them are fussy.

Frozen shredded hash browns skip the hardest step. They are already peeled, shredded, and par-cooked, so the potatoes finish tender in the oven without turning to mush or staying raw in the center.
Sour cream plus condensed soup builds a stable sauce. The fat and starch coat every shred and hold moisture through a long bake, which keeps the casserole creamy instead of dry at the edges.
A buttered cornflake top gives real crunch. Butter carries heat into the flakes so they toast and brown, delivering the crisp contrast that a bare cheese top can’t.

Ingredient Notes

A few choices here decide whether the casserole is creamy or watery, so they are worth a note.

Frozen shredded hash browns: Thaw them fully and press out the water. Diced Southern-style hash browns work too, but shredded gives the classic soft texture.
Cream of chicken soup: The standard binder. Cream of mushroom or cream of celery swaps in cleanly if that’s what’s in the pantry.
Sour cream: Full-fat holds up best under heat. Plain whole-milk Greek yogurt is a workable tangy substitute in a pinch.
Sharp cheddar: Shred it from a block if you can; pre-shredded is coated in anti-caking starch that melts less smoothly.
Cornflakes: Crush them lightly, not to dust. You want flakes big enough to stay crunchy. Panko or crushed butter crackers are fair stand-ins.

How to Make Cheesy Hashbrown Casserole

The short version, full amounts and times are in the recipe card below.

Step 1: Mix the base. Stir the soup, sour cream, melted butter, cheddar, Parmesan, and seasonings together, then fold in the thawed, pressed hash browns until every shred is coated.

Frozen shredded hash browns and shredded cheddar folded into a creamy sour cream and soup mixture in a large glass bowl

Step 2: Assemble and top. Spread the mixture into a greased 9x13 dish, scatter more cheddar over it, then sprinkle on the buttered cornflakes.

Hashbrown mixture spread in a white 9x13 baking dish and topped with an even layer of buttered crushed cornflakes before baking

Step 3: Bake until bubbly. Bake at 350°F for 50 to 55 minutes, until the edges bubble and the top is deep golden. The center should reach 165°F/74°C. Rest 10 minutes before serving.

Finished cheesy hashbrown casserole with a golden bubbling cornflake crust, one corner scooped out to reveal creamy cheddar potatoes

How Long to Bake by Dish Size

Bake time shifts with the pan and how deep the casserole sits. Use these as a starting point, and confirm doneness with a thermometer.

Dish size	Approx. batch	Oven temp	Bake time	Doneness cue
8x8 (half batch)	15 oz hash browns	350°F / 177°C	40-45 min	Edges bubbling, center 165°F
9x13 (full batch)	30 oz hash browns	350°F / 177°C	50-55 min	Top golden, center 165°F
Deep 9x13 (doubled cheese)	30 oz, extra fillings	350°F / 177°C	55-65 min	Bubbles at center, 165°F

Pro Tips

Press the potatoes dry. Squeeze thawed hash browns in a clean towel or colander to remove excess water, the single biggest cause of a watery casserole.
Add the cornflakes last. Butter and top them just before baking so they toast rather than sog under the sauce.
Check for 165°F. An instant-read thermometer in the center is the honest doneness test; the top can brown before the middle is hot.
Rest 10 minutes. A short rest lets the sauce set so squares hold their shape instead of sliding apart.
Shred your own cheese. Block cheddar melts creamier than pre-shredded, which is dusted with anti-caking starch.

Variations

Once the base is down, it takes swaps well. Here are the ones we reach for.

Loaded ranch: Stir 1 tablespoon dry ranch seasoning into the base and finish with chopped chives and crumbled cooked bacon.
Extra-crisp cracker top: Swap the cornflakes for crushed butter crackers tossed with melted butter for a richer, saltier crust.
Cheddar-Parmesan: Push the Parmesan to 1 cup and use a mix of sharp and mild cheddar for a deeper cheese flavor.
Veggie-forward: Fold in 1 cup thawed chopped broccoli or sauteed onion for a heartier, less rich casserole.

Storage & Reheating

Cool leftovers, then refrigerate in an airtight container for up to 3 to 4 days. Reheat individual portions in the microwave or a covered dish in a 350°F oven until the center reaches 165°F/74°C, about 20 to 25 minutes for a large portion.

To freeze, wrap the cooled baked casserole tightly and freeze up to 3 months. Thaw overnight in the fridge, then reheat covered at 350°F until hot through and 165°F/74°C in the center. You can also freeze it unbaked and bake straight from thawed.

FAQ

A few questions come up every time we make this, so here are quick answers.

Do I have to thaw the hash browns first?

Yes, thaw and press them dry. Frozen shreds release water as they cook, which thins the sauce and can leave the center undercooked. Thawing and squeezing keeps the casserole creamy.

Can I make cheesy hashbrown casserole ahead of time?

Absolutely. Assemble it without the cornflake topping, cover, and refrigerate up to 24 hours. Add the buttered cornflakes just before baking and add a few minutes to the bake time since it starts cold.

Why is my hashbrown casserole watery?

Almost always excess moisture from the potatoes. Fully thaw the hash browns and press out the water before mixing, and use full-fat sour cream, which holds together better than low-fat under heat.

Can I use cream of mushroom instead of cream of chicken?

Yes. Cream of mushroom or cream of celery both work as a one-to-one swap. The flavor shifts slightly, but the texture stays the same.

What to Serve With

This casserole is a rich side, so pair it with something bright and a simple protein. It’s a natural next to roast chicken, and our crispy air fryer chicken breast is an easy weeknight match.

For a spread, round it out with more make-ahead comfort from our casserole recipes or a lighter starter from our soups collection.