Martha Stewart Christmas Breakfast Casserole for a Cozy Holiday Morning
The perfect make-ahead Martha Stewart Christmas Breakfast Casserole for a festive and stress-free holiday morning. This savory dish is layered with sourdough bread, sausage, and nutty Gruyère cheese, all soaked in a rich egg custard and baked until golden and puffy.
- Prep Time: 20 minutes
- Cook Time: 1 hour
- Total Time: 9 hours 20 minutes
- Yield: 8 servings
- Category: Breakfast
- Method: Baking
- Cuisine: American
Ingredients
- 1 lb breakfast sausage
- 1 large yellow onion, chopped
- 1 (1-pound) loaf of sourdough bread, cut into 1-inch cubes
- 2 cups shredded Gruyère cheese
- 1/2 cup grated Parmesan cheese
- 8 large eggs
- 2 cups whole milk
- 1 cup heavy cream
- 1 tbsp Dijon mustard
- 1 tsp salt
- 1/2 tsp black pepper
- 1/4 tsp ground nutmeg
Instructions
1. Cook sausage and onion in a skillet until browned. Drain the grease.
2. In a large bowl, combine bread cubes, sausage mixture, and cheeses. Transfer to a greased 9×13-inch baking dish.
3. In the same bowl, whisk together all egg custard ingredients.
4. Pour the custard evenly over the bread mixture. Cover and refrigerate for at least 8 hours or overnight.
5. Preheat oven to 350°F (175°C). Let the casserole sit at room temperature for 30 minutes.
6. Bake uncovered for 50-60 minutes until golden and set. Let rest for 10 minutes before serving.
Notes
Prepare this casserole the night before for a stress-free holiday morning.
Gruyère cheese can be substituted with sharp white cheddar if preferred.
To save time, chop onion and cube bread a day in advance.