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Ultimate Make-Ahead Christmas Breakfast Casserole with Sausage and Gruyère

Close-up of a hearty slice of Christmas breakfast casserole featuring layers of egg, sausage, and melted, browned cheese.
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Prepare this hearty, savory Christmas breakfast casserole the night before for a stress-free holiday morning. It features a sourdough base, rich sausage, and melted Gruyère cheese, perfect for feeding a crowd.

Ingredients

Scale
  • 1 pound bulk pork sausage
  • 1 (10-ounce) loaf sourdough bread, cut into 1-inch cubes
  • 1 1/2 cups shredded Gruyère cheese
  • 1 cup shredded sharp cheddar cheese
  • 10 large eggs
  • 2 1/2 cups whole milk
  • 1 teaspoon Dijon mustard
  • 1/2 teaspoon salt
  • 1/4 teaspoon black pepper
  • 1/4 teaspoon nutmeg

Instructions

  1. Cook the sausage in a large skillet over medium heat until browned. Drain off excess fat and set the sausage aside.
  2. Lightly grease a 9×13 inch baking dish.
  3. Arrange half of the cubed sourdough bread evenly in the bottom of the prepared dish.
  4. Sprinkle half of the cooked sausage and half of the Gruyère and cheddar cheeses over the bread layer.
  5. Top with the remaining sourdough bread, followed by the remaining sausage and cheeses.
  6. In a large bowl, whisk together the eggs, milk, Dijon mustard, salt, pepper, and nutmeg until fully combined.
  7. Slowly pour the egg mixture evenly over the bread and cheese layers in the baking dish, pressing down gently to help the bread absorb the liquid.
  8. Cover the dish tightly with plastic wrap. Refrigerate for at least 8 hours, or preferably overnight.
  9. When ready to bake, preheat your oven to 350 degrees Fahrenheit. Remove the plastic wrap.
  10. Bake uncovered for 50 to 60 minutes, or until the casserole is puffed, golden brown on top, and a knife inserted near the center comes out clean.
  11. Let the Christmas breakfast casserole rest for 10 minutes before slicing and serving.

Notes

  • For a Martha Stewart style variation, ensure you use good quality sourdough bread for the best texture.
  • If you need a quicker morning, you can assemble this up to 24 hours ahead of time.
  • This recipe is excellent for a crowd; adjust the size of your baking dish if you need to serve more than 8-10 people.

Nutrition

Find it online: https://purecookingjoy.com/christmas-breakfast-casserole-recipe/

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