The most delicious prep-ahead Breakfast Casserole made with sausage, egg, hashbrowns, and plenty of cheese. Make this easy recipe for breakfast, brunch, or a special occasion! Make it ahead of time for busy mornings and serve with your favorite breakfast sides.
Preheat the oven to 350°F. Lightly grease a 9x13-inch baking dish with cooking spray.
Add the sausage to a large skillet and place over medium-high heat. Cook until browned, breaking the sausage up into smaller pieces with a spoon during cooking. Remove the sausage with a slotted spoon, leaving drippings in skillet.
In the same skillet, add the hashbrowns, bell pepper, and green onion and cook over medium-high heat, stirring occasionally, until the hashbrowns are thawed and the bell pepper is tender, about 5 minutes. Remove from the heat and let cool for 5 minutes.
In a large bowl, beat together the eggs, milk, salt, and pepper. Stir in sausage, hashbrown mixture, and 2 cups of shredded cheese. Pour the mixture into the prepared pan. Sprinkle the remaining 1 cup of cheese over the top.
Bake until the edges are lightly browned and the center is set, about 55 minutes. Let stand for 5 minutes before serving. Garnish with chopped green onion, if desired.
Notes
Add toppings. Once baked, serve this egg casserole with garnishes like fresh chopped green onion, cilantro, or parsley. It is also delicious served with pico de gallo, salsa, hot sauce, sour cream, or avocado.
Let it rest before serving. Let the casserole sit at room temperature for at least 5 minutes before serving to allow it to firm up and slice easily.
Make it meat-free. Simply skip the sausage and swap it for a vegetable like sundried tomatoes or mushrooms with an umami flavor.
Optional variations. Give it a kick by adding a pinch of red pepper flakes. Add an herbal profile by stirring in 1 teaspoon of dried Italian seasoning, parsley, or basil. Additionally, sneak in some extra servings of veggies by adding chopped kale, spinach, zucchini, or extra bell peppers, or try out different proteins by adding in all or part cooked crispy bacon or crumbled ground beef.