🥘 Sausage Breakfast Casserole (Make Ahead)

This Sausage Breakfast Casserole is the ultimate crowd-pleasing breakfast or brunch dish—hearty, flavorful, and perfect for feeding a group. The best part? You can assemble it the night before and simply bake it in the morning for a stress-free, delicious meal.

📝 Recipe

Prep Time: 20 minutes (+ optional overnight chilling)
Cook Time: 45–55 minutes
Serves: 8–10

Ingredients

1 lb (450g) breakfast sausage (mild or spicy), casings removed if needed
1 medium onion, diced
1 red or green bell pepper, diced
8 large eggs
2 cups whole milk (or half-and-half for extra richness)
1 tsp dry mustard (or Dijon mustard)
1 tsp salt
½ tsp black pepper
½ tsp garlic powder
½ tsp paprika (optional)
6 cups bread cubes (about ½ loaf, preferably stale or lightly toasted; French, sourdough, or brioche work well)
2 cups shredded cheddar cheese (or a mix of cheddar and Monterey Jack), divided
Optional add-ins: 1 cup sliced mushrooms, 2 cups fresh spinach, or 1 cup diced cooked potatoes

📋 Instructions

1. Cook the Sausage & Veggies

Preheat oven to 350°F (175°C). Grease a 9×13-inch baking dish.
In a large skillet over medium heat, cook sausage, breaking it into small crumbles, until browned (about 6–8 minutes). Remove sausage with a slotted spoon and set aside.
In the same skillet (with about 1 tbsp of sausage drippings), sauté onion and bell pepper until softened, about 5 minutes. Add any optional veggies here (like mushrooms or spinach) and cook until wilted/softened.

2. Assemble the Casserole

Spread bread cubes evenly in the prepared baking dish.
Sprinkle cooked sausage and veggie mixture over the bread.
Top with 1½ cups of the shredded cheese.

3. Prepare the Egg Mixture

In a large bowl, whisk together eggs, milk, dry mustard, salt, pepper, garlic powder, and paprika until well combined.

4. Pour & Top

Pour the egg mixture evenly over the bread, sausage, and cheese layers.
Gently press down on the bread with a spatula to help it absorb the liquid.
Sprinkle the remaining ½ cup cheese on top.

5. Bake Immediately or Refrigerate Overnight

To Bake Now: Bake uncovered for 45–55 minutes, until the center is set and the top is golden brown.
To Make Ahead: Cover tightly with plastic wrap or foil and refrigerate overnight (or up to 24 hours). Let sit at room temperature for 20–30 minutes before baking as directed.

6. Serve

Let the casserole cool for 5–10 minutes before slicing.
Garnish with chopped fresh parsley, chives, or green onions if desired.

🧠 Tips for Success

Use stale or toasted bread to prevent a soggy casserole. Cube fresh bread and leave it out overnight, or toast cubes at 300°F for 10–15 minutes until dry.
Don’t skip the dry mustard—it adds a subtle depth of flavor.
Check for doneness: The casserole is ready when a knife inserted in the center comes out clean and the top is puffed and golden.
Customize it:
- Vegetarian: Omit sausage and add sautéed mushrooms, spinach, and sundried tomatoes.
- Spicy: Use hot Italian sausage and add a dash of cayenne or chopped jalapeños.
- Meat lovers: Add cooked, crumbled bacon or diced ham.

🥡 Storage & Reheating

Refrigerate leftovers for up to 4 days.
Freeze individual portions for up to 2 months. Thaw overnight in the fridge.
Reheat in the microwave or oven until warmed through.

🍽 Serving Suggestions

Serve with fresh fruit salad, hash browns, or a simple green salad.
Perfect for holiday mornings, brunch parties, or meal prep for busy weeks.

Enjoy this hearty, comforting, and versatile breakfast casserole—it’s guaranteed to become a family favorite! 🍳🧀