Salads & Side dishes

Cheesy Hash Brown Potato Casserole with Sour Cream

By Clara ·
November 1, 2026

The edges start bubbling first, and the cornflakes turn a deep golden color while the middle settles into a creamy, tender casserole. I give this cheesy hash brown potato casserole with sour cream a full 10 minutes to rest after baking; it’s much easier to serve when the filling has had a moment to settle.

Thawed shredded hash browns are what make the filling easy to stir together and spread evenly. They mingle with sour cream, cheddar, onion, and condensed soup without leaving icy pockets in the dish. The buttered cornflake topping brings the crisp contrast that keeps each bite from feeling too soft. It’s a straightforward casserole, but the creamy middle and crunchy top make it worth bringing to the table.

Why thawed hash browns make a creamier casserole

Frozen shredded potatoes can be convenient, but putting them in the dish while they’re still frozen changes how the filling bakes. Ice crystals melt in the oven, adding moisture right where you want the potatoes to hold a creamy mixture. The hash browns also chill the sour cream and soup, so the casserole takes longer to heat through evenly.

Let the potatoes thaw before you stir everything together. Once thawed, the shreds are easier to separate and coat with the soup, sour cream, and cheddar. That even coating matters: you want potatoes throughout the dish, not a few dry patches next to pockets of concentrated sauce. The mixture should spread across the pan without needing extra liquid, and the cornflakes can crisp on top as the filling bakes.

The topping gives the casserole its other defining texture. Butter helps the crushed flakes brown as they bake, while an even layer means you get crunch across the surface instead of a few scattered crisp spots. Keep the potatoes thawed and the topping spread edge to edge, and the casserole has a good balance of creamy filling and crisp top.

What the sour cream, soup, and cheddar each bring

• Sour cream — It adds tang and moisture to balance the savory soup and cheddar. Plain full-fat Greek yogurt is the closest easy swap; use the same amount, knowing the casserole will taste a little tangier and less rich.
• Condensed cream of chicken soup — This is the concentrated savory base that binds the potato mixture. Use it straight from the can rather than thinning it; adding liquid makes the filling looser.
• Cheddar — Cheddar brings a familiar sharp, salty note and melts into the potatoes. A block you shred yourself tends to melt smoothly, while pre-shredded cheddar is a practical choice if convenience matters.
• Frozen shredded hash browns — The fine shreds mix through the creamy base and make each serving cohesive. Check that they’re thawed before mixing; that’s more important here than choosing a premium brand.
• Cornflakes and butter — Crushed cornflakes bake into a light, crisp topping, and melted butter helps them brown. Crush the flakes into small pieces rather than powder so the finished surface keeps some crunch.
• Yellow onion — Finely chopping the onion helps it disperse through the filling instead of leaving big, sharp bites. A white onion can stand in at the same amount, with a slightly more pungent flavor.

Mixing and baking for a creamy center with a golden top

Coat the thawed potatoes evenly

Heat the oven to 350°F and grease a 9×13-inch baking dish. In a large bowl, stir together the thawed hash browns, condensed cream of chicken soup, sour cream, shredded cheddar, finely chopped onion, salt, and pepper. Keep stirring until the ingredients are distributed throughout, rather than stopping when the sauce first looks combined. If you spot an uncoated clump of potatoes, fold it back through the creamy mixture before moving on.

Spread the filling in the baking dish

Transfer the mixture to the prepared dish and spread it into an even layer. This gives the casserole a consistent depth from edge to edge, so the potatoes bake together rather than leaving a thin, overbrowned corner beside a thick section. Use the back of a spoon or spatula to smooth the surface without packing it down tightly. The mixture should reach the corners of the dish.

Scatter on the buttered cornflakes

Stir the crushed cornflakes with the melted unsalted butter until the flakes are lightly coated. Scatter them evenly over the filling instead of leaving all the crumbs in the middle. If the flakes are crushed to dust, they’ll lose the larger crisp pieces that make the topping pleasant; aim for small pieces, not a fine crumb. Spread any bare patches before the dish goes into the oven.

Bake until the edges bubble and the flakes turn golden

Bake for 45–55 minutes, watching for bubbling around the edges and a golden-brown topping. The flakes should look toasted rather than pale, and the filling should be hot and bubbling at the perimeter. If the topping is still pale, give it more time within the baking window instead of pulling the dish early. Let the casserole rest for 10 minutes before serving.

Three sensible ways to adapt the casserole

Questions that come up when making hash brown casserole

Cheesy Hash Brown Potato Casserole with Sour Cream

Cheesy hash brown potato casserole with sour cream combines shredded potatoes, cheddar, and cream of chicken soup in a bubbly bake. A buttery cornflake topping turns golden and crisp while the casserole stays creamy underneath.

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 55 minutes mins

resting 10 minutes mins

Total Time 1 hour hr 20 minutes mins

Servings: 10 servings

Course: Side Dish

Cuisine: American

Calories: 435

Ingredients Equipment Method Notes

Ingredients

  

For the casserole

• 1 bag (30 oz) frozen shredded hash browns thawed
• 1 can (10.5 oz) condensed cream of chicken soup
• 2 cups sour cream
• 2 cups shredded cheddar cheese
• 0.5 yellow onion medium, finely chopped
• 0.5 tsp kosher salt
• 0.25 tsp black pepper

For the topping

• 2 cups cornflakes crushed
• 0.25 cup unsalted butter melted

Equipment

• 1 9x13-inch baking dish

Method

 

Prepare the casserole

1. Heat the oven to 350°F.
2. Grease a 9x13-inch baking dish.
3. In a large bowl, stir together the thawed hash browns, condensed cream of chicken soup, sour cream, shredded cheddar cheese, finely chopped yellow onion, kosher salt, and black pepper until evenly combined.
4. Spread the mixture in the prepared baking dish.

Make the topping and bake

1. Stir the crushed cornflakes and melted unsalted butter together.
2. Scatter the topping mixture evenly over the casserole.
3. Bake for 45–55 minutes, until the casserole is bubbling around the edges and the topping is golden brown.
4. Let the casserole rest for 10 minutes before serving.

Notes

For the crispest topping, thaw the hash browns before mixing. Refrigerate leftovers for 3–4 days; freezing is possible, though the cornflake topping may soften. For a vegetarian version, use condensed cream of mushroom soup instead of cream of chicken soup.