As the saying goes, breakfast is the most important meal of the day. That inspired this easy, satisfying Breakfast Casserole — an oven-baked mash-up of all your favorite morning flavors. A base of hashbrowns supports a savory sausage, onion, and pepper skillet, topped with cheddar and a rich egg custard. It’s simple to assemble, feeds a crowd, and can be made ahead for busy mornings.
If you enjoy savory starts, this casserole will become a go-to. It is hearty without being complicated and reheats well for quick second servings.
About This Recipe
I’ve been leaning toward more savory breakfasts lately. Waffles and pancakes are delicious, but sweet breakfasts often leave me feeling sluggish. This casserole delivers savory satisfaction and steady energy to start the day. It takes about 15 minutes to assemble and roughly an hour to bake, making it practical for weekends or special breakfasts. For weekday prep, assemble most of it the night before and finish baking in the morning.
The recipe is flexible: swap proteins, change the cheese, or add vegetables you have on hand. It serves well for family brunches or a simple dinner when you want something comforting and low fuss.
Key Ingredients
Hashbrowns: Use 6–8 frozen hash brown patties (or equivalent shredded hashbrowns pressed into the dish) to form the bottom layer of the casserole.
Pork sausage: Breakfast-style pork sausage works well for its flavor and texture. Substitute turkey sausage or a plant-based crumbled sausage if preferred.
Onion: A small yellow onion, finely diced, adds sweetness and depth.
Bell peppers: I used half a red and half a green bell pepper for color, but you can use any combination or a single pepper.
Cheddar cheese: One to two cups shredded cheddar — use 1 cup for a moderate cheese presence or up to 2 cups if you prefer it extra cheesy.
Eggs: Eight large eggs create a rich custard that binds the casserole.
Milk: Any milk percentage will work; 1 cup is sufficient to make the egg mixture pourable and silky.
Seasoning: Salt and black pepper to taste. You can add a pinch of garlic powder, smoked paprika, or a few fresh herbs for variation.
Instructions
STEP 1: Preheat the oven to 350°F (175°C) and grease a 3-quart baking dish. Arrange the hashbrowns in an even layer across the bottom. Six patties usually fill a standard dish; trim or add patties as needed to fit.
STEP 2: In a large skillet over medium-high heat, cook the sausage, breaking it into small pieces until browned and no longer pink. Add the diced onion and cook for 1–2 minutes until softened.
STEP 3: Remove the skillet from the heat and stir in the diced bell peppers so they retain some texture and color.
STEP 4: Spread the sausage, onion, and pepper mixture evenly over the hashbrown base in the baking dish.
STEP 5: In a large bowl, whisk together the eggs, milk, ½ teaspoon salt, and ½ teaspoon black pepper until smooth.
STEP 6: Sprinkle the shredded cheddar over the sausage layer, then pour the egg and milk mixture evenly over the top.
STEP 7: Bake uncovered at 350°F (175°C) for 50–60 minutes, or until the center is set. Insert a knife into the middle; if the blade comes out with uncooked egg, continue baking a few more minutes. Let rest for 5–10 minutes before slicing.
📋 Recipe
Ingredients
- 6–8 frozen hash brown patties (or equivalent shredded hashbrowns)
- 1 pound pork sausage (breakfast sausage recommended)
- 1 small yellow onion, finely diced
- ½ red bell pepper, diced
- ½ green bell pepper, diced
- 1–1½ cups shredded cheddar cheese, divided
- 8 large eggs
- 1 cup milk
- ½ teaspoon salt
- ½ teaspoon black pepper
Instructions
- Preheat the oven to 350°F and grease a 3-quart baking dish.
- Arrange the hashbrowns in the baking dish to form an even bottom layer.
- Heat a large skillet over medium-high heat. Add the sausage and cook until browned, breaking it into small pieces. Add the onion and cook 1–2 minutes more. Remove from heat and stir in the bell peppers.
- Spread the sausage mixture over the hashbrowns, then sprinkle with cheese.
- In a large bowl, whisk together eggs, milk, salt, and black pepper. Pour the mixture evenly over the casserole.
- Bake uncovered for 50–60 minutes or until the eggs are set in the center. If the middle is still soft, return to the oven and bake a few minutes longer. Let cool slightly before serving.
- Serve warm. Ketchup, hot sauce, or a dollop of sour cream are nice accompaniments.
Notes
Make Ahead: For faster mornings, prepare through Step 5 but keep the egg mixture separate. Cover the assembled casserole and the egg mixture and refrigerate overnight. In the morning, pour the eggs over the dish and bake as directed.
Storage and Reheating: Refrigerate leftovers in an airtight container for up to 3 days. Reheat individual portions in the microwave for 1–2 minutes or in a 350°F oven until warmed through. The casserole also freezes well — wrap tightly and freeze up to 2 months; thaw overnight before reheating.
Variations: Swap cooked bacon, ham, or shredded chicken for sausage. Add sautéed mushrooms, spinach, or zucchini for extra vegetables. Try pepper jack or mozzarella instead of cheddar for a different flavor profile.