AmericanBreakfast

Easy Make-Ahead Breakfast Casserole

Name: Easy Make-Ahead Breakfast Casserole
Prep time: 20 min
Cook time: 45 min
Total time: 1 h 30 min
Yield: 12
Cuisine: American
Ingredients: 4 cups (175g) cubes of crusty bread; 1 tsp olive oil; 1 lb ground pork sausage, casings removed; 1 tsp dried rosemary or Italian seasoning, optional; 3/4 cup (100g) chopped yellow onion; 2 garlic cloves, minced; 2 cups (275g) chopped bell peppers; 1 cup (100g) sliced mushrooms; 1 cup roughly chopped fresh spinach; 12 large eggs; 1/4 tsp salt; 1/8 tsp freshly ground black pepper; 2/3 cup (160ml) milk or half-and-half; 1 cup (100g) shredded cheddar cheese; Green onion and/or chopped parsley for garnish, optional

Savory bread cubes soak up a rich mixture of browned sausage, sautéed vegetables, and aromatic herbs, creating a satisfying casserole that's assembled the night before. The combination of tender mushrooms, sweet peppers, and garlicky sausage delivers deep, comforting flavors that taste like you've been cooking all morning. Perfect for busy weekends when you want a hot, impressive breakfast without the morning rush.

Prep

20 minutes

Cook

45 minutes

Total

1 hour 30 minutes

Serves

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Ingredients

Units

Instructions

1
Grease a 9×13-inch or any 3–4-quart oven-safe dish. Arrange bread cubes in an even layer in the bottom of the pan.
2
Heat olive oil in a large skillet over medium heat. Add sausage and rosemary or Italian seasoning, if using, and break up the sausage into bite-size pieces with a wooden spoon or rubber spatula as it begins to cook. Add the onion, garlic, peppers, mushrooms, and spinach and cook until everything has slightly softened and sausage is mostly cooked through, about 5–6 minutes.
3
Remove sausage and vegetable mixture from heat and spread in an even layer on top of bread.
4
Whisk the eggs, salt, pepper, milk, and cheese together. Evenly pour over sausage and vegetable mixture. Add another sprinkle of salt and pepper on top.
5
Cover casserole with plastic wrap or aluminum foil and refrigerate for at least 30 minutes and up to 24 hours. When ready to bake, allow to sit at room temperature for 10–15 minutes as oven preheats.
6
Preheat the oven to 375°F (191°C). Bake the casserole, uncovered, until the top is golden, edges are crisp, and a toothpick inserted in the center comes out clean, about 40–45 minutes.
7
Cool for 10 minutes, then slice and serve.

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Easy Make-Ahead Breakfast Casserole

Prep

20 minutes

Cook

45 minutes

Total

1 hour 30 minutes

Serves

Jump to recipe

Ingredients

Units

Instructions

1
Grease a 9×13-inch or any 3–4-quart oven-safe dish. Arrange bread cubes in an even layer in the bottom of the pan.
2
Heat olive oil in a large skillet over medium heat. Add sausage and rosemary or Italian seasoning, if using, and break up the sausage into bite-size pieces with a wooden spoon or rubber spatula as it begins to cook. Add the onion, garlic, peppers, mushrooms, and spinach and cook until everything has slightly softened and sausage is mostly cooked through, about 5–6 minutes.
3
Remove sausage and vegetable mixture from heat and spread in an even layer on top of bread.
4
Whisk the eggs, salt, pepper, milk, and cheese together. Evenly pour over sausage and vegetable mixture. Add another sprinkle of salt and pepper on top.
5
Cover casserole with plastic wrap or aluminum foil and refrigerate for at least 30 minutes and up to 24 hours. When ready to bake, allow to sit at room temperature for 10–15 minutes as oven preheats.
6
Preheat the oven to 375°F (191°C). Bake the casserole, uncovered, until the top is golden, edges are crisp, and a toothpick inserted in the center comes out clean, about 40–45 minutes.
7
Cool for 10 minutes, then slice and serve.

Reviews

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