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Make Ahead Breakfast Casserole for Busy Mornings

Savory breakfast casserole with sausage, peppers, cheese, and golden crust.

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This savory breakfast casserole is your secret to a stress-free morning. Prepared the night before with sausage, eggs, cheese, and biscuits, it bakes up golden and delicious, giving you back precious time. It’s endlessly customizable and perfect for feeding a crowd.

Ingredients

Scale
  • 1 pound breakfast sausage, cooked and crumbled
  • 1 medium yellow onion, diced
  • 1 red bell pepper, diced
  • 6 large eggs
  • 2 cups whole milk
  • 1 teaspoon dry mustard powder
  • 1 teaspoon kosher salt
  • 1/2 teaspoon black pepper
  • 1/2 teaspoon garlic powder
  • 1 (16 oz) can refrigerated flaky layer biscuits, cut into 1-inch pieces
  • 2 cups shredded sharp cheddar cheese, divided

Instructions

  1. Cook sausage in a skillet until browned. Remove, leaving 1 tbsp drippings. Saute onion and bell pepper in drippings until soft, 5-7 minutes. Let cool slightly.
  2. In a large bowl, whisk eggs, milk, dry mustard, salt, pepper, and garlic powder until smooth.
  3. Grease a 9×13 inch baking dish. Scatter biscuit pieces in the bottom.
  4. Top with the sausage and vegetable mixture. Sprinkle with 1 1/2 cups cheese.
  5. Pour the egg custard mixture evenly over everything. Gently press down with a spatula.
  6. Sprinkle with remaining 1/2 cup cheese. Cover tightly and refrigerate for at least 4 hours, preferably overnight.
  7. Preheat oven to 350°F (175°C). Let casserole sit at room temperature while oven heats.
  8. Bake uncovered for 45-55 minutes, until golden brown and set in the center.
  9. Let rest for 10 minutes before slicing and serving.

Notes

For a vegetarian version, omit sausage and add thawed hash browns or black beans. The overnight chill is crucial for the best texture. Leftovers reheat well. Customize with spinach, mushrooms, or different meats.

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