Step 5: Make the Egg Mixture
In a large mixing bowl, crack the eggs.
Add the milk, heavy cream, salt, black pepper, paprika, garlic powder, and dried parsley.
Whisk until the eggs and milk are fully combined.
The milk and cream help create a soft, rich texture. If you prefer a lighter casserole, you can use only milk instead of cream.
Step 6: Layer the Casserole
Spread the bread cubes or hash browns evenly in the greased baking dish.
Add the cooked sausage over the top.
Sprinkle the cooked onion, bell pepper, and garlic mixture over the sausage.
Add most of the shredded cheddar and mozzarella cheese, saving some cheese for the top.
Pour the egg mixture evenly over everything. Make sure the liquid reaches all corners of the dish.
Use a spoon to gently press the ingredients down so the bread or potatoes absorb the egg mixture.
Step 7: Add the Final Cheese Layer
Sprinkle the remaining cheese over the top of the casserole.
This final layer melts beautifully and creates a golden, cheesy surface as the casserole bakes.
For extra flavor, you can add a little paprika or chopped parsley on top before baking.
Step 8: Bake the Casserole
Place the baking dish in the preheated oven.
Bake for 40 to 50 minutes, or until the center is set and the top is golden.
The casserole is ready when a knife inserted into the center comes out mostly clean and the eggs no longer look wet.
If the top browns too quickly before the center is cooked, loosely cover the dish with foil and continue baking.
Step 9: Let It Rest Before Serving
Remove the casserole from the oven and let it rest for 10 minutes.
This resting time helps the casserole firm up and makes it easier to slice. It also allows the flavors to settle.
Do not skip this step, especially if you want clean square portions.
Step 10: Slice and Serve
Cut the casserole into squares and serve warm.
It pairs well with fresh fruit, toast, biscuits, avocado, salad, roasted potatoes, or a simple cup of coffee.
You can also serve it with hot sauce, sour cream, salsa, or extra green onions on top.
Make-Ahead Method
To prepare this casserole the night before, assemble everything in the baking dish, cover it tightly, and refrigerate overnight.
The next morning, remove it from the refrigerator about 20 minutes before baking.
Bake as directed, adding 5 to 10 extra minutes if the casserole is still very cold.
This method is perfect for Christmas morning, brunch gatherings, or busy weekdays.
Helpful Tips for Best Results
Use cooked sausage, not raw sausage. Raw sausage will release too much grease and may not cook evenly inside the casserole.
Drain the sausage well after browning.
Do not use too much liquid. The casserole should be moist, not soupy.
Use freshly shredded cheese if possible because it melts better.
Let the casserole rest after baking so it holds its shape.
If using vegetables with high moisture, such as spinach or mushrooms, cook them first.
Flavor Variations
For a spicy version, use hot breakfast sausage, pepper jack cheese, and diced jalapeños.
For a Southern-style version, use sausage, cheddar cheese, and biscuit pieces instead of bread.
For a vegetable-heavy version, add spinach, mushrooms, tomatoes, and bell peppers.
For a loaded breakfast version, add bacon, hash browns, sausage, and extra cheese.
For a lighter version, use turkey sausage, low-fat milk, and reduced-fat cheese.
Storage and Reheating
Store leftovers in an airtight container in the refrigerator for up to 4 days.
To reheat, warm individual portions in the microwave for 1 to 2 minutes. For the best texture, reheat in the oven at 325°F / 160°C until warm.
You can also freeze the casserole. Cut it into portions, wrap them well, and freeze for up to 2 months. Thaw overnight in the refrigerator before reheating.
Final Thoughts
Cheesy Sausage Breakfast Casserole is a simple, filling, and flavorful dish that works for almost any breakfast occasion. It combines savory sausage, fluffy eggs, melted cheese, and bread or potatoes into one warm, satisfying bake.
It is easy to prepare, simple to customize, and perfect for feeding a group. Whether you make it fresh in the morning or prepare it the night before, this casserole is a dependable breakfast recipe that tastes comforting, cheesy, and homemade.
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