Overnight Breakfast Casserole
Overnight Breakfast Casserole features bites of hearty bread, sausage, veggies and cheese all nestled into the very best creamy seasoned egg mixture! Itโs the best make ahead recipe thatโs easy to assemble and even easier to serve to a crowd. Use this low stress recipe to make your mornings delicious!
Overnight Breakfast Casserole
Allow me to paint the picture for you that I myself have envisioned all too many times. Itโs Christmas morning and youโve made everything perfect โ Santa has delivered the perfect gifts, the fireplace is crackling at the perfect temperature, and everyone has the most perfect matching pajamas. But thereโs an issueโฆ everyone is hungry and you donโt have a breakfast plan.
If youโve also found yourself in this position, Iโm here to change the game forever! This overnight breakfast casserole is a lifesaver not just on Christmas morning, but any time you have a big morning with family and/or friends. Itโs great for feeding a small army and itโs nice and low stress so you donโt have to work too hard first thing in the morning. Itโs like our Easy Amish Hash Brown Breakfast Casserole but without the hash browns.
You pretty much just have to toss everything into a baking dish, cover it, and let it hang out in the fridge overnight. In the morning, you bake it for about 40 minutes and voila! Breakfast is served, and it is so good. Cheeses, veggies, sausage and boldly seasoned eggs come together in the best medley of flavors and textures thatโll keep you full after just one protein-packed serving.
How to Make Overnight Breakfast Casserole
Take a quick look at how easy it is to make this breakfast casserole! For more details, scroll down to the recipe card.
- Add the first layer. Spray a casserole dish with cooking spray. Then, add the bread cubes in a single layer on the bottom and cover them with half of the cheddar cheese.
- Cook the sausage. Heat a skillet over medium heat. Add the sausage to the pan and break it up as it cooks into smaller bite sized pieces. Cook until itโs fully browned. Use a slotted spoon to transfer it to a bowl. Reserve about 1 TBSP of fat in the skillet.
- Sautรฉ the veggies. Add the chopped onions to the pan and cook until softened. Stir in the peppers, mushrooms, garlic and fresh spinach. Keep cooking until everything starts to soften. Mix in the Italian seasoning.
- Add the sausage. Toss the sausage back into the pan and remove it from the heat.
- Assemble the casserole. Spread the sausage and veggies all over the cheesy bread. In a different bowl, whisk together the eggs with all of the seasonings and half and half. Pour this mixture all over the casserole in an even layer.
- Refrigerate. Wrap the dish with plastic wrap and let it chill in the fridge for at least 30 minutes and up to 24 hours. Like I said, great make ahead recipe!
- Bake. Let the casserole adjust to room temperature for 30 minutes prior to baking. Then, bake uncovered at 375ยฐF for 40-45 minutes or until golden brown and cooked all the way through.
- Rest and garnish. Rest for about 15 minutes at room temperature prior to garnishing with parmesan, green onions and fresh parsley.
Make it Vegetarian
Just omit the sausage entirely or replace it with a plant based alternative.
How Long Can This Casserole Stay in the Refrigerator
This can be prepared and placed in the fridge, unbaked, for up to 24 hours. Just make sure itโs covered tightly with plastic wrap.
What kind of bread works best?
Use a hearty, sturdy bakery bread like challah, sourdough or Italian. Remember to remove the crust! Also, note that you can omit the bread if youโd like this recipe to be low carb.
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Get the Recipe: Overnight Breakfast Casserole Recipe
Ingredients
- 2 cups hearty bread cut into 1 inch cubes, crust removed
- 1 cup shredded cheddar cheese
- 1 cup shredded Colby Jack or Pepper Jack cheese
- 1 pound bulk sausage or sausage with casings removed
- 1 large onion, diced
- 1 red bell pepper, diced
- 1 orange bell pepper, diced
- 8 ounces sliced mushrooms
- 2 garlic cloves, minced
- 2 cups baby spinach, chopped
- 1 tablespoon Italian seasoning
- 12 large eggs
- 1/2 tablespoon garlic powder
- 1/2 teaspoon onion powder
- 1/4 teaspoon kosher salt
- 1/4 teaspoon freshly ground pepper
- 1 cup half and half
- Grated Parmesan cheese, Green onion and parsley for garnish, optional
Equipment
- 1 baking dish
Instructions
- Coat a 9ร13 baking dish with cooking spray.
- Arrange the bread cubes in an even layer on the bottom of the dish.
- Sprinkle half the cheddar cheese over the bread and reserve the remaining cheese for later.
- Heat a large skillet over medium heat. Add the sausage to the pan and break up into bite sized pieces with a fork or spatula as it cooks. Cook the sausage until no longer pink. Transfer to a bowl with a slotted spoon and drain off all but 1 tablespoon of fat.
- Add the onion to the pan and cook until beginning to soften. Stir in the bell peppers, mushrooms, garlic and spinach. Continue to cook until beginning to soften.
- Add the Italian seasoning and cook for 1 minute.
- Add the sausage back to the pan and remove from the heat.
- Spread the sausage mixture evenly over the bread and cheese.
- Whisk together the eggs, garlic powder, onion powder, salt, pepper and half and half.
- Pour the egg mixture over the casserole in an even layer.
- Cover with plastic wrap and refrigerate for no less than 30 minutes and up to 24 hours.
- When ready to bake, remove the casserole from the refrigerator, top with the remaining cheese and rest at room temperature for 30 minutes.
- Preheat the oven to 375หF.
- Bake the casserole, uncovered, for 40-45 minutes or until golden brown, puffed up and the center is cooked through. (You can test it with a toothpick, if it comes out clean, itโs fine.)
- Allow to rest at room temperature for 15 minutes.
- Sprinkle with parmesan cheese, green onion and parsley, if using.
- Serve hot or room temperature.
6 Comments on โOvernight Breakfast Casseroleโ
can this be made in a slow cooker? Love your recipes!
Havenโt tried this yet but it looks and sounds terrific. Going to have it for Christmas morning!!! Iโll let you know how it goes. Thank you in advance!
Youโre very welcome! Have a wonderful Christmas!
Kellie, we donโt consume any type of cheese. Question for you, have you ever heard of a casserole similar, but without cheese? Itโs so hard to find a tasty decent overnight casserole like the one here.
Sure! You can make it without the cheese and it will still be incredible.
Thank you!