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Ultimate Overnight Breakfast Casserole

This creamy breakfast casserole is perfect for busy mornings, easy to prepare the night before, and packed with comforting flavors.
Prep Time 15 minutes
Cook Time 1 hour 10 minutes
Total Time 1 hour 25 minutes
Course Breakfast, brunch
Cuisine American
Servings 8 servings
Calories 420 kcal

Ingredients
  

Meat and Dairy Ingredients

  • 1 pound breakfast sausage
  • 1 cup milk
  • 1 cup sour cream
  • 8 large eggs

Vegetables and Seasonings

  • 1/2 teaspoon salt
  • 1/4 teaspoon black pepper
  • 1/4 cup chopped green onions For topping

Main Components

  • 30 oz frozen hash browns Approximately one package
  • 2 cups shredded cheddar cheese Or other cheese types as desired

Instructions
 

Preparation

  • Cook the sausage in a skillet over medium heat until browned. Set aside to cool.
  • In a large bowl, whisk together the eggs, milk, sour cream, salt, and pepper until smooth.
  • Grease a 9x13 baking dish; layer half of the hash browns, half the cooked sausage, and a layer of cheese.
  • Repeat the layers with the remaining hash browns, sausage, and cheese.
  • Pour the egg mixture evenly over the top of the layered ingredients.
  • Cover with foil and refrigerate overnight.

Baking

  • Preheat the oven to 350°F in the morning and bake the casserole, covered, for 45 minutes.
  • Remove the foil and bake an additional 20–25 minutes until golden and fully set.
  • Top with chopped green onions and serve warm.

Notes

Pair this casserole with fresh fruit, crispy bacon, or a light salad for a balanced meal. For added spice, sprinkle with hot sauce.
Keyword breakfast casserole, comfort food, easy breakfast, Make Ahead Meal, Overnight Casserole