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A close-up of a hearty slice of Christmas breakfast casserole featuring bread, sausage, and melted, browned cheese.

Make-Ahead Sourdough Sausage and Gruyère Christmas Breakfast Casserole


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  • Author: Ahazzam
  • Total Time: 1 hour 10 min
  • Yield: 10 servings 1x
  • Diet: Vegetarian

Description

Prepare this savory, crowd-pleasing breakfast casserole the night before for a stress-free Christmas morning bake.


Ingredients

Scale
  • 1 pound bulk breakfast sausage
  • 1 (10.5 ounce) can condensed cream of mushroom soup
  • 1 cup milk
  • 1 teaspoon dry mustard powder
  • 1/2 teaspoon black pepper
  • 1/4 teaspoon salt
  • 12 slices sourdough bread, cubed
  • 2 cups shredded Gruyère cheese
  • 1 cup shredded sharp cheddar cheese
  • 8 large eggs
  • 1 cup half-and-half

Instructions

  1. Cook the sausage in a large skillet until browned. Drain off all grease and set the sausage aside.
  2. In a bowl, whisk together the cream of mushroom soup, milk, dry mustard, pepper, and salt until smooth.
  3. Lightly grease a 9×13 inch baking dish.
  4. Arrange half of the cubed sourdough bread evenly in the bottom of the prepared dish.
  5. Sprinkle half of the cooked sausage and half of the Gruyère and cheddar cheeses over the bread layer.
  6. Top with the remaining bread, sausage, and cheeses.
  7. In a separate bowl, whisk the eggs and half-and-half until combined. Pour this egg mixture evenly over the entire casserole.
  8. Cover the baking dish tightly with plastic wrap. Refrigerate for at least 8 hours or overnight.
  9. When ready to bake, preheat your oven to 350 degrees Fahrenheit. Remove the plastic wrap.
  10. Bake uncovered for 45 to 55 minutes, or until the casserole is puffed, golden brown, and a knife inserted near the center comes out clean.
  11. Let the casserole rest for 10 minutes before slicing and serving.

Notes

  • You can substitute cubed hash browns for the sourdough bread if you prefer a different base texture.
  • If you use ham instead of sausage, cook and dice it before layering.
  • For easier serving, assemble the casserole in the dish the day before you plan to bake it.
  • Prep Time: 20 min
  • Cook Time: 50 min
  • Category: Breakfast
  • Method: Baking
  • Cuisine: American

Nutrition

  • Serving Size: 1 slice
  • Calories: 450
  • Sugar: 3
  • Sodium: 750
  • Fat: 30
  • Saturated Fat: 15
  • Unsaturated Fat: 15
  • Trans Fat: 1
  • Carbohydrates: 25
  • Fiber: 1
  • Protein: 22
  • Cholesterol: 150
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