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A slice of cheesy breakfast casserole with sausage and peppers on a plate, partially cut with a fork.

Make Ahead Breakfast Casserole Recipe

Author: Jessica Haggard
Make your mornings effortless with this easy overnight breakfast casserole. It’s loaded with fluffy eggs, savory sausage, tender mushrooms, and melty cheese - a hearty, incredibly tasty meal that the whole family will love. Prep for 20 minutes, sleep, and bake fresh in the morning. The best part? You’ll wake up to a clean kitchen!
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Prep Time 20 minutes
Cook Time 50 minutes
Total Time 1 hour 10 minutes
Course Breakfast
Cuisine American
Servings 12 servings
Calories 494 kcal

Ingredients
 
 

  • 4 cups crusty bread cubed
  • 1 pound pork sausage
  • 1 cup sliced mushrooms
  • 1 medium red bell pepper diced
  • 4 green onions thinly sliced
  • 12 large eggs
  • 2 cups cheddar cheese shredded
  • 1 cup milk
  • ½ teaspoon salt
  • ½ teaspoon ground black pepper

Instructions
 

  • Grease a 9x13-inch baking dish and arrange the bread in a single layer across the bottom.
  • Use a sharp knife to slice open the sausage casing and remove the meat. Alternatively, you can thinly slice the sausage.
  • Brown the meat in a skillet over medium heat. Break it up into small pieces. Add the mushrooms, bell pepper and onion and saute for 4 minutes until soft.
  • Spread the meat and vegetables over the bread. Sprinkle green onion evenly over the top. Whisk the eggs, cheese, milk, salt, and pepper in a medium bowl. Pour over the meat. Cover with plastic wrap or aluminum foil and refrigerate overnight.
  • When ready to bake, move to room temperature while the oven preheats to 350 °F.
  • Uncover and bake the casserole for 50 minutes or until the center is set and a knife inserted to the center comes out clean. The edges should be golden brown. Cool for 15 minutes before serving warm.

Video

Notes

  • If using watery vegetables like mushrooms or spinach, sauté them first to prevent excess moisture from making the casserole too wet.
  • If the top starts to brown too quickly, cover the casserole loosely with foil for the last 10 minutes of baking.
  • Keep an eye on the casserole toward the end of baking. You want it to be set but still soft and fluffy inside. You’ll know it’s ready when the edges are golden brown and the center is just slightly jiggly.
  • After baking, let the casserole sit for 15 minutes before cutting into it. This helps it firm up and makes slicing easier.
  • Add some freshness to the dish with chopped herbs, salsa, or avocado slices just before serving to brighten up the rich flavors.
Serve: Enjoy on its own or with some fresh fruit and yogurt. For brunch, serve with pastries like flaky croissants, muffins, or scones, additional breakfast meats like maple bacon or sausage links, or a side of hashbrowns or home fries. Freshly brewed coffee, hot chocolate, breakfast smoothies, or herbal teas all complement this savory dish.
Store: Transfer leftovers into an airtight container and store in the refrigerator for up to 5 days, or in the freezer for up to 1 month. To reheat, warm individual portions in the microwave or the whole pan in the oven at 350 F until heated through.

Nutrition

Calories: 494kcalCarbohydrates: 44gProtein: 26gFat: 24gSaturated Fat: 9gPolyunsaturated Fat: 3gMonounsaturated Fat: 8gTrans Fat: 0.1gCholesterol: 234mgSodium: 1015mgPotassium: 333mgFiber: 2gSugar: 5gVitamin A: 871IUVitamin C: 14mgCalcium: 235mgIron: 5mg
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