Martha Stewart Style Christmas Breakfast Casserole: The Ultimate Holiday Brunch

There is something undeniably magical about Christmas morning. The wrapping paper is flying, the coffee is brewing, and the house is filled with the anticipation of a joyous day. However, for the designated family cook, this morning can also bring a dash of stress. Enter the Christmas Breakfast Casserole. Inspired by the comforting, reliable elegance of Martha Stewart’s cooking philosophy, this savory strata is the answer to your holiday prayers.

This isn’t just an egg dish; it is a warm hug in a baking dish. Imagine cubes of crusty bread soaked in a rich, savory custard, layered with browned sausage and bubbling melted cheese, all baked until it achieves a spectacular golden-brown crust. It’s hearty enough to fuel the family through gift-opening yet elegant enough to feel like a special occasion meal. The best part? It tastes even better when assembled the night before, allowing you to actually enjoy the morning festivities.

Why This Recipe Works

The beauty of a strata lies in its texture. By allowing the bread to soak up the egg and milk mixture (ideally overnight), the interior becomes almost souffle-like—fluffy, moist, and tender—while the top transforms into a crispy, cheesy shield. The contrast between the soft, savory interior and the crunch of the golden crust is what makes this dish a recurring star on holiday tables.

Ingredients

For the Casserole Base:

• 1 pound (450g) – ground pork sausage (sage or maple flavored works beautifully)
• 1 medium – yellow onion, finely chopped
• 1 clove – garlic, minced
• 8 cups – day-old bread, cut into 1-inch cubes (sourdough, brioche, or French bread)
• 2 cups (200g) – sharp cheddar cheese, shredded
• 1 cup (100g) – Gruyère or Swiss cheese, shredded (adds a nutty depth)
• 2 tablespoons – fresh parsley, chopped (for garnish)

For the Custard:

• 8 large – eggs
• 2 ½ cups – whole milk (or half-and-half for extra richness)
• 1 teaspoon – dry mustard powder
• ½ teaspoon – salt
• ½ teaspoon – black pepper
• ¼ teaspoon – cayenne pepper (optional, for a subtle kick)

Instructions

1. Prepare the Meat: In a large skillet over medium-high heat, cook the sausage and chopped onion. Break up the sausage with a wooden spoon as it cooks. Sauté until the sausage is browned and the onions are translucent (about 8-10 minutes). Add the minced garlic during the last minute of cooking. Drain any excess grease and set aside to cool slightly.
2. Prepare the Baking Dish: Grease a 9×13 inch baking dish (or a large deep round casserole dish as pictured) generously with butter or non-stick spray.
3. Layer the Ingredients: Spread half of the bread cubes evenly across the bottom of the prepared dish. Top with half of the sausage mixture and half of the shredded cheeses. Repeat with the remaining bread, sausage, and cheese.
4. Make the Custard: In a large mixing bowl, whisk together the eggs, milk, dry mustard, salt, black pepper, and cayenne pepper until well combined and slightly frothy.
5. Soak: Pour the egg mixture evenly over the layered ingredients in the baking dish. Press down slightly with a spatula to ensure all the bread pieces are soaking up the liquid.
6. Chill (The “Make-Ahead” Secret): Cover the dish tightly with aluminum foil or plastic wrap. Refrigerate for at least 1 hour, or ideally overnight. This allows the bread to fully absorb the custard, preventing a dry casserole.
7. Bake: Preheat your oven to 350°F (175°C). Remove the casserole from the refrigerator about 20 minutes before baking to take the chill off. Bake covered with foil for 20 minutes. Then, remove the foil and bake for another 25-30 minutes, or until the center is set and the top is puffed and golden brown.
8. Serve: Let the casserole rest for 10 minutes before slicing (this helps it hold its shape). Garnish with fresh chopped parsley and serve warm.

Tips for Success

• The Bread Matters: Avoid flimsy sandwich bread. You want a sturdy loaf with a good crust. Sourdough offers a nice tang that cuts through the richness, while Brioche makes for a sweeter, more decadent breakfast. If your bread is fresh, toast the cubes in the oven for 10 minutes to dry them out so they absorb more custard.
• Cheese Please: Grating your own cheese is always superior to pre-shredded bags. Pre-shredded cheese contains anti-caking agents that prevent it from melting into that glossy, liquid-gold texture you see in the photos.
• Vegetarian Option: Swap the sausage for sautéed mushrooms, spinach, and red bell peppers. Just ensure you cook the water out of the vegetables before adding them to the bake to avoid a soggy bottom.

Serving Suggestions

This casserole is a complete meal on its own, but to round out a festive brunch, consider serving it alongside:

• A fresh fruit salad with seasonal citrus or berries to cut the richness.
• Crispy hash browns or roasted breakfast potatoes.
• A light arugula salad with a lemon vinaigrette.
• Mimosas or fresh orange juice.

Storage and Reheating

Leftovers can be stored in an airtight container in the refrigerator for up to 3 days. Reheat individual slices in the microwave for 1-2 minutes, or place them in the oven at 325°F covered with foil until warmed through to maintain the texture.