Hash Brown Casserole with Crispy Cornflake Topping

Quick Recipe Overview

Prep 15 minutes; cook 50 minutes; additional 10 minutes; total 75 minutes. Yield 10 side servings. Side Dish, American. Difficulty: easy.

Intro

Hash brown casserole is a creamy, cheesy potato side with a crisp golden topping. This version makes its own quick sauce, so the ingredients are easy to check and the potato filling stays rich without becoming soupy. It fits a Christmas dinner alongside lighter vegetables.

Why You’ll Love This Recipe

A simple stovetop sauce replaces condensed soup.

Thawed, squeezed potatoes bake evenly without pooling water.

The cornflake topping stays crunchy against the creamy filling.

Recipe Card

Hannah Brooks

Hash Brown Casserole with Crispy Cornflake Topping

This hash brown casserole bakes shredded potatoes in a creamy cheddar sauce under a buttery cornflake topping. It is an easy, crowd-size side for a holiday table.

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 50 minutes mins

Cooling 10 minutes mins

Total Time 1 hour hr 15 minutes mins

Servings: 10 side servings

Calories: 330

Ingredients Equipment Method Notes

Ingredients

  

• 30 ounces frozen shredded hash browns thawed and squeezed dry
• 1/4 cup unsalted butter divided
• 1 whole small yellow onion finely diced
• 3 tablespoons all-purpose flour for thickening
• 1 cup whole milk for sauce
• 1 cup sour cream for sauce
• 2 cups shredded cheddar cheese made with microbial or vegetarian rennet
• 1 teaspoon kosher salt for seasoning
• 1/2 teaspoon black pepper for seasoning
• 2 cups plain cornflakes lightly crushed

Equipment

• 1 9-by-13-inch baking dish for baking
• 1 Medium saucepan for sauce
• 1 Large mixing bowl for mixing

Method

 

1. Heat the oven to 350°F and lightly grease a 9-by-13-inch baking dish.
2. Melt 2 tablespoons unsalted butter in a saucepan over medium heat. Cook the yellow onion for 5 minutes until soft.
3. Stir in all-purpose flour for 1 minute. Whisk in whole milk and simmer 2 to 3 minutes until thickened; remove from heat.
4. Stir sour cream, shredded cheddar cheese, kosher salt, and black pepper into the sauce. Fold the sauce into thawed, dry frozen shredded hash browns in a bowl.
5. Spread the potatoes in the dish. Melt the remaining 2 tablespoons unsalted butter and toss with plain cornflakes, then scatter over the potatoes.
6. Bake 45 to 50 minutes until bubbling at the edges and the topping is golden. Rest 10 minutes before serving.

Notes

Nutrition is an estimate per side serving. Thaw and squeeze the potatoes dry to keep the sauce creamy.

Recipe Tips

Thaw the hash browns fully and squeeze them in a clean towel. Extra water thins the sauce.

Crush cornflakes lightly, leaving small flakes rather than powder.

Let the casserole rest after baking so the sauce settles around the potatoes.

A clean kitchen towel makes it easy to squeeze thawed potatoes dry in batches. If the towel still feels damp after the first squeeze, press again. The potatoes should remain fluffy rather than compressed into a dense ball.

The sauce should be thick enough to coat a spoon before it meets the potatoes. If it looks thin, simmer it another minute while whisking. Spread the filling to an even depth in the dish so the corners do not dry out before the middle is hot.

Common Mistakes to Avoid

Do not put frozen potatoes directly in the dish; they can make the center watery.

Do not boil the sauce hard after adding sour cream. Gentle heat keeps it smooth.

Do not cover the pan while baking or the topping will steam.

Variations

Add sautéed diced red bell pepper for color and sweetness.

Use plain toasted breadcrumbs instead of cornflakes for a different crunch.

Use a blend of cheddar and Monterey Jack made with microbial or vegetarian rennet.

What to Serve With It

Pair this rich side with Christmas salad and green bean casserole for a colorful spread. A spoonful of cranberry sauce adds a tart contrast. Browse the recipe index for more ideas.

Storage

Refrigerate cooled leftovers in a covered container for up to 3 days. Keep hot food at safe serving temperatures during a buffet; see the USDA leftovers guidance.

Reheating

Warm covered at 350°F until hot throughout, then uncover briefly to crisp the topping. The microwave warms portions but softens the cornflakes.

Make Ahead

Mix the potato filling and refrigerate in the dish up to 1 day. Store the buttered cornflakes separately and add them just before baking. Allow extra time if the filling is cold.

If making the filling a day ahead, cover it tightly and refrigerate right away. Hold the cornflakes in a separate airtight container at room temperature. Toss them with melted butter shortly before baking, because a damp topping will not crisp.

A chilled casserole may take 5 to 10 minutes longer in the oven. Watch for steady bubbles around the edge and a hot center instead of relying on the original bake time alone.

For a potluck, bake the casserole in the same dish you plan to carry. Let it rest uncovered for 10 minutes so the topping stays crisp, then cover only for transport. If the trip is long, keep the dish properly hot or chill and reheat it at the destination. Add a fresh handful of crushed cornflakes just before serving if the top softens under a lid.

FAQs

Can I assemble hash brown casserole ahead?

Yes. Refrigerate the filling for up to a day and add the cornflake topping before it goes into the oven.

Why is my casserole watery?

Potatoes that were not fully thawed and squeezed dry release water as they bake.

Can I use diced hash browns?

Yes, but the texture will be chunkier and the center may need a little longer to heat through.