Cheesy Potato Breakfast Casserole (Easy + Cheesy)
This Cheesy Potato Breakfast Casserole is a simple, hearty breakfast that’s perfect for feeding a crowd. Made with flavorful Italian sausage, sautéed onions, frozen hash browns, eggs, milk, and plenty of cheddar cheese, it bakes into a warm, cheesy casserole that everyone loves.
Ingredients
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1 pound Italian sausage, cooked
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1 yellow onion, chopped (sautéed in sausage grease)
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7 large eggs
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1/2 cup milk
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1 (20 oz) bag frozen diced hash browns
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8 oz mild cheddar cheese, grated
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Salt and pepper, to taste
Instructions
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Preheat oven to 350°F (175°C). Spray a 9×13-inch baking dish (or medium casserole dish) with non-stick spray.
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Cook the Italian sausage in a skillet until browned and fully cooked.
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In the same skillet, sauté the chopped onion in the sausage grease until softened (about 3–4 minutes).
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In a large mixing bowl, whisk together the eggs and milk.
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Add the hash browns, cooked sausage, sautéed onions, grated cheddar, plus salt and pepper. Stir until well combined.
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Pour the mixture into the prepared baking dish. Reserve about 1 cup of cheese for topping.
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Bake for 35 minutes.
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Remove from oven, sprinkle the reserved cheese on top, and return to the oven for 8 more minutes (or until cheese is melted).
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Let casserole rest for 15–20 minutes before slicing. Serve warm.
Notes
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If possible, let the hash browns thaw for 10–15 minutes before mixing. This helps the casserole bake more evenly.
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For extra flavor, add 1/2 teaspoon garlic powder, 1/2 teaspoon paprika, or a pinch of red pepper flakes.
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For a richer casserole, replace milk with half-and-half.
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Let the casserole rest before cutting so it sets and slices cleanly.