Breakfast casserole is the ultimate make-ahead dish for busy mornings, family gatherings, or weekend brunches. Packed with savory sausage, fluffy eggs, melted cheese, and a colorful mix of bell peppers and green onions, this hearty casserole is as delicious as it is easy to make. Whether you’re hosting a crowd or meal-prepping for the week, this versatile dish is a winner. With simple ingredients and minimal prep time, you can have a warm, comforting breakfast on the table in no time—perfect for feeding a hungry family or impressing guests at brunch.
Why You’ll Love This Breakfast Casserole
If you’re looking for a breakfast that checks all the boxes—flavorful, filling, and easy to prepare—this breakfast casserole will become your go-to recipe. It’s great for meal prep, can be customized with different mix-ins, and works well for holidays or casual mornings. The blend of sausage, eggs, cheese, and veggies creates the perfect balance of savory flavors, while the sour cream keeps it creamy and light. Best of all, it’s oven-baked, so you can prep it ahead and let the oven do the work while you enjoy your morning.
Ingredients
Here’s what you’ll need to make this delicious casserole:
- 2 pounds pork sausage – for a rich, savory base
- 12 large eggs – provide a light, fluffy texture and plenty of protein
- 1 cup sour cream (light or regular) – adds creaminess and tang
- ¼ cup milk – helps make the eggs tender
- 1 teaspoon kosher salt – enhances flavor
- ½ teaspoon ground black pepper – brings a mild, peppery warmth
- 4 green onions – for freshness and mild onion flavor
- ½ green bell pepper, diced – for color and crunch
- ½ red bell pepper, diced – adds sweetness and vibrancy
- 2 cups shredded cheddar cheese – for a gooey, cheesy topping
Step-by-Step: How to Make Breakfast Casserole
- Preheat the oven: Set your oven to 350°F (175°C) and lightly grease a 9×13-inch baking dish with cooking spray.
- Prepare the egg mixture: In a large mixing bowl, whisk together the eggs, sour cream, milk, salt, pepper, and cheese until well combined.
- Cook the sausage: In a large skillet over medium heat, cook the pork sausage until browned, breaking it up with a wooden spoon. Drain most of the grease and add the sausage to the egg mixture.
- Sauté the veggies: Using the same skillet, sauté the bell peppers and green onions for 2–3 minutes until softened. Add them to the egg and sausage mixture.
- Combine and bake: Pour the mixture into the prepared baking dish, spreading it evenly. Bake for 35–50 minutes, until the edges are firm and the center has a gentle jiggle.
- Cool and serve: Allow the casserole to rest for several minutes before slicing.
Helpful Tips
- Make-ahead tip: Prepare the casserole in advance, cover it tightly, and refrigerate overnight.
- For crispier edges: Add an extra 5 minutes to the baking time if you prefer a firmer texture.
Substitutions and Variations
- Swap the sausage: Try bacon, turkey sausage, or even diced cooked chicken for a lighter option.
- Go vegetarian: Leave out the meat and add extra vegetables like mushrooms, spinach, or zucchini.
- Change the cheese: Use Monterey Jack, pepper jack, or Swiss for a flavor twist.
- Add potatoes: Mix in shredded hash browns for a heartier casserole.
Storage Instructions
- Refrigerate: Store leftovers in an airtight container for 3–4 days.
- Freeze: Bake, cool completely, then wrap tightly in foil and freeze for up to 2 months. Thaw in the refrigerator overnight, then reheat in the oven.
- Reheat: Warm slices in the microwave or oven at 325°F until heated through.
Nutritional Information
- Calories: 385 kcal
- Protein: 23 g
- Fat: 30 g
- Carbohydrates: 2 g
- Cholesterol: 239 mg
- Sodium: 669 mg
- Calcium: 194 mg
Serving Suggestions
- Pair with fresh fruit salad or buttery croissants for a complete breakfast.
- Serve with a side of crispy hash browns or avocado toast for extra satisfaction.
- Drizzle with hot sauce or salsa for a zesty kick.
Frequently Asked Questions About Breakfast Casserole
Can I make breakfast casserole ahead of time?
Yes! Assemble it the night before, cover with foil, and refrigerate. In the morning, bake as directed—just add 5–10 minutes to the bake time since it’s starting cold.
Can I freeze breakfast casserole?
Absolutely. Bake it first, let it cool completely, then wrap tightly in plastic wrap and foil. Freeze for up to 2 months. Thaw overnight in the fridge before reheating.
Can I use different meats or veggies?
Definitely. This recipe is versatile—swap sausage for bacon, turkey sausage, or even diced cooked chicken. You can also add spinach, mushrooms, or diced tomatoes for extra flavor.
How do I know when it’s done baking?
The casserole is ready when the edges are set, and the center is slightly jiggly. A knife inserted in the center should come out mostly clean.
Conclusion
Thank you for trying this breakfast casserole recipe! It’s one of my favorite go-to dishes for busy mornings, brunch parties, or meal prep because it’s so easy to make and packed with flavor. I hope you enjoy every cheesy, savory bite as much as I do. Whether you customize it with your favorite mix-ins or stick to the classic version, this casserole is sure to become a staple in your kitchen. Happy cooking, and thank you for being part of our food-loving community!
Follow us on Pinterest for daily recipe inspiration!
Print
Ultimate Breakfast Casserole Recipe
- Total Time: 50–65 minutes
- Yield: 12 servings 1x
- Diet: Gluten Free
Description
This hearty Breakfast Casserole combines savory sausage, fluffy eggs, melted cheese, and colorful veggies for a flavorful, make-ahead dish perfect for busy mornings, family brunches, or holiday breakfasts.
Ingredients
2 pounds pork sausage
12 large eggs
1 cup sour cream (light or regular)
¼ cup milk
1 teaspoon kosher salt
½ teaspoon ground black pepper
4 green onions, chopped
½ green bell pepper, diced
½ red bell pepper, diced
2 cups shredded cheddar cheese
Instructions
- Preheat the oven: Set your oven to 350°F (175°C) and lightly grease a 9×13-inch baking dish with cooking spray.
- Prepare the egg mixture: In a large mixing bowl, whisk together the eggs, sour cream, milk, salt, pepper, and cheese until well combined.
- Cook the sausage: In a large skillet over medium heat, cook the pork sausage until browned, breaking it up with a wooden spoon. Drain most of the grease and add the sausage to the egg mixture.
- Sauté the veggies: Using the same skillet, sauté the bell peppers and green onions for 2–3 minutes until softened. Add them to the egg and sausage mixture.
- Combine and bake: Pour the mixture into the prepared baking dish, spreading it evenly. Bake for 35–50 minutes, until the edges are firm and the center has a gentle jiggle.
- Cool and serve: Allow the casserole to rest for several minutes before slicing
Notes
Prepare ahead: Assemble, cover tightly, and refrigerate overnight before baking.
Freeze after baking: Wrap tightly, freeze for up to 2 months, thaw overnight, then reheat.
Swap sausage with bacon, turkey sausage, or cooked chicken for variation.
- Prep Time: 15 minutes
- Cook Time: 35–50 minutes
- Category: Breakfast
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 1 piece
- Calories: 385
- Fat: 30g
- Carbohydrates: 2g
- Protein: 23g