A breakfast casserole is a warm, comforting, and satisfying dish perfect for feeding a crowd. Packed with protein, veggies, and gooey cheese, this casserole is ideal for holiday mornings, weekend brunches, or meal prep for the week ahead.
Plus, it’s easy to make and can be prepared the night before for a stress-free morning. This recipe serves 12 generous portions, making it a fantastic go-to for family gatherings or potlucks.
1. Breakfast Casserole Recipe
Equipment You’ll Need
To prepare this breakfast casserole seamlessly, gather the following tools:
- 9×13 Glass Baking Dish: Essential for baking the casserole evenly.
- Meat Chopper: Helps break up sausage efficiently while cooking.
- Vegetable Chopper (Optional): Speeds up prep time for chopping peppers and onions.
Ingredients
Here’s everything you’ll need for this hearty breakfast casserole:
- 2 pounds pork sausage
- 12 large eggs
- 1 cup sour cream (light or regular) – approximately 240 grams
- 1/4 cup milk – approximately 60 milliliters
- 1 teaspoon kosher salt
- 1/2 teaspoon ground black pepper
- 4 green onions – finely sliced
- 1/2 green bell pepper – diced
- 1/2 red bell pepper – diced
- 2 cups shredded cheddar cheese – approximately 200 grams
Instructions
Step 1: Preheat and Prepare
Preheat your oven to 350°F (175°C). Lightly grease a 9×13 glass baking dish with cooking spray or a thin layer of butter. Set aside.
Step 2: Cook the Sausage
In a large skillet over medium heat, cook the pork sausage, using a meat chopper to break it up into crumbles. Continue cooking for about 8–10 minutes until fully browned and no longer pink. Drain any excess grease and set the sausage aside to cool slightly.
Step 3: Chop the Vegetables
While the sausage is cooking, dice the red and green bell peppers and slice the green onions. If you have a vegetable chopper, this step will go much faster.
Step 4: Mix the Egg Base
In a large bowl, whisk together the 12 eggs, 1 cup sour cream, 1/4 cup milk, kosher salt, and black pepper until smooth. The sour cream gives the casserole a creamy texture and helps keep it moist.
Step 5: Assemble the Casserole
Evenly spread the cooked sausage into the bottom of the prepared baking dish. Layer the diced bell peppers and green onions over the sausage. Sprinkle 2 cups of shredded cheddar cheese on top.
Pour the egg mixture slowly and evenly over the entire dish, allowing it to seep into all the layers. Tap the dish gently on the counter to remove any air bubbles.
Step 6: Bake
Place the casserole in the oven and bake for 40–45 minutes, or until the eggs are fully set and the top is golden brown. A knife inserted in the center should come out clean.
Step 7: Rest and Serve
Let the casserole rest for at least 10 minutes before slicing. This helps it firm up and makes serving easier. Cut into 12 equal pieces and serve warm.
2. Tips for the Perfect Breakfast Casserole
Use Room-Temperature Eggs: Let your eggs sit out for a few minutes before mixing. They blend more smoothly and bake more evenly.
Drain Sausage Well: Too much grease can make the casserole soggy. Drain the sausage thoroughly before layering.
Let It Rest Before Cutting: A 10-minute rest after baking lets the casserole firm up, making it easier to slice and serve.
Don’t Overbake: Check the center at 40 minutes. Overbaking can dry the casserole out.
Customize the Cheese: Use a mix of cheddar and mozzarella for a gooier, stretchier texture.
3. Variations & Substitutes
Swap the Meat: Substitute the pork sausage with turkey sausage, ham, or cooked bacon for a different flavor profile.
Make It Vegetarian: Omit the sausage altogether and add sautéed mushrooms, spinach, or zucchini instead.
Add Potatoes: For a heartier dish, add a layer of shredded hash browns or diced cooked potatoes before pouring the egg mixture.
Try Different Cheeses: Pepper jack, Swiss, or Monterey Jack can give the casserole a new twist.
Spice It Up: Add diced jalapeños or a dash of hot sauce to the egg mixture for a spicy kick.
4. How to Store & Reheat Leftovers
Storing and reheating your breakfast casserole is easy and convenient:
- Refrigerate: Allow the casserole to cool completely, then cover the dish tightly with foil or transfer slices to an airtight container. Store in the refrigerator for up to 4 days.
- Freeze: For longer storage, wrap individual portions in plastic wrap and place them in a freezer-safe bag or container. Freeze for up to 2 months.
- Reheat in Microwave: Place a slice on a microwave-safe plate and heat on high for 1–2 minutes, or until hot.
- Reheat in Oven: Preheat oven to 325°F (165°C). Cover the casserole with foil and bake for 15–20 minutes, or until warmed through.
A breakfast casserole like this is more than just a morning meal—it’s a delicious way to bring people together. With its rich flavors, protein-packed ingredients, and endless customization options, it’s a dish that can suit any occasion or palate. Whether you’re preparing it for a special brunch or simply making your mornings easier during the week, this casserole delivers both convenience and taste in every bite.
