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Martha Stewart Style Christmas Breakfast Casserole

A rich and savory holiday strata featuring sausage, eggs, and melted cheese absorbed into crusty bread. Perfect for make-ahead Christmas mornings.
Print Recipe
Prep Time 20 minutes
Cook Time 50 minutes
Total Time 1 hour 10 minutes
Servings: 8 slices
Course: Breakfast, Brunch
Cuisine: American, Holiday
Calories: 450
Ingredients Equipment Method Notes

Ingredients
  

Casserole Base
  • 1 lb ground pork sausage sage or maple
  • 1 medium yellow onion chopped
  • 8 cups bread cubes sourdough or brioche
  • 2 cups sharp cheddar cheese shredded
  • 1 cup Gruyère cheese shredded
Custard Mixture
  • 8 large eggs
  • 2.5 cups whole milk
  • 1 tsp dry mustard powder
  • 0.5 tsp salt
  • 0.5 tsp black pepper

Equipment

  • 9x13 Baking Dish
  • Skillet
  • Whisk
  • Mixing Bowl

Method
 

  1. Brown sausage and onions in a skillet; drain excess grease.
  2. Grease a baking dish and layer bread cubes, cooked sausage, and cheeses.
  3. Whisk together eggs, milk, mustard, salt, and pepper.
  4. Pour egg mixture over the layers and press down slightly.
  5. Cover and refrigerate for at least 1 hour or overnight.
  6. Preheat oven to 350°F (175°C).
  7. Bake covered for 20 minutes, then uncovered for 25-30 minutes until golden.
  8. Let rest for 10 minutes before serving.

Notes

For best results, prepare the night before and bake in the morning.