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Grandma's Hashbrown Casserole

Grandma's Hashbrown Casserole

Grandma's Hashbrown Casserole is a creamy, cheesy, and comforting potato casserole made with shredded hashbrowns, cheddar cheese, sour cream, and a buttery crispy cornflake topping. Perfect for holiday dinners, potlucks, family gatherings, or an easy make-ahead side dish.
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Prep Time 15 minutes
Cook Time 50 minutes
Resting time 10 minutes
Total Time 1 hour 15 minutes
Servings: 10
Course: Side Dish
Cuisine: American
Calories: 385
Ingredients Method Notes

Ingredients
  

  • For the Casserole
  • 30 oz frozen shredded hashbrowns thawed (about 6 cups)
  • 2 cups shredded sharp cheddar cheese
  • 1 cup shredded mozzarella cheese optional
  • 1 10.5 oz can cream of chicken soup (or cream of mushroom soup)
  • 1 cup sour cream
  • ½ cup unsalted butter melted
  • ½ cup diced onion
  • ½ teaspoon garlic powder
  • ½ teaspoon salt
  • ¼ teaspoon black pepper
  • Crispy Topping
  • 1½ cups crushed cornflakes or Ritz crackers or breadcrumbs
  • 2 tablespoons melted butter
  • ½ cup shredded cheddar cheese optional
  • Optional Add-Ins
  • ½ cup cooked bacon crumbled
  • ½ cup diced ham
  • 2 tablespoons chopped green onions or chives
  • ¼ cup diced jalapeños
  • ½ cup diced bell peppers

Method
 

  1. Preheat the oven to 350°F (175°C) and lightly grease a 9×13-inch baking dish.
  2. In a large mixing bowl, combine the thawed hashbrowns, cream of chicken soup, sour cream, melted butter, cheddar cheese, mozzarella (if using), diced onion, garlic powder, salt, and black pepper. Stir until everything is evenly combined.
  3. Spread the potato mixture evenly into the prepared baking dish.
  4. In a separate bowl, mix the crushed cornflakes with the melted butter until coated. Sprinkle the topping evenly over the casserole. Add the remaining cheddar cheese over the top if desired.
  5. Bake for 45–50 minutes, or until the casserole is hot and bubbly and the topping is golden brown and crispy. If the topping browns too quickly, loosely cover with foil during the last few minutes of baking.
  6. Remove from the oven and let the casserole rest for 10 minutes before serving.
  7. Serve warm with roast chicken, turkey, ham, pork chops, meatloaf, or your favorite holiday meal.

Notes

  • Thaw frozen hashbrowns before mixing for the best texture.
  • Sharp cheddar provides the richest flavor.
  • Add cooked bacon or diced ham for an even heartier casserole.
  • Prepare the casserole a day ahead, refrigerate, and bake just before serving.
  • Leftovers reheat beautifully in the oven or air fryer.
  • Freeze the unbaked casserole for up to 2 months.