Martha Stewart’s Christmas Breakfast Casserole Recipe

There’s a certain magic to Christmas morning, a quiet hum in the house before the chaos of wrapping paper and joy erupts. For me, the aroma of coffee brewing and something savory baking in the oven is the true start to the festivities. This Martha Stewart Christmas Breakfast Casserole recipe has become the heart of that tradition. It’s more than just a meal; it’s a gift to my future self, a promise of a relaxed, present morning with my family instead of being stuck at the stove. The beauty of this dish is its make-ahead nature, allowing all the rich flavors of sausage, nutty Gruyère, and tangy sourdough to meld together overnight into something truly special. It’s the ultimate centerpiece for a holiday brunch, a dish that feels both incredibly luxurious and wonderfully homey.

What sets this recipe apart from other Christmas Morning Casserole Recipes is its elegant simplicity and depth of flavor. Inspired by Martha Stewart’s classic approach, it uses high-quality ingredients to create a dish that’s both rustic and refined. The sourdough bread provides a sturdy, chewy base that stands up to the rich egg custard, while the combination of Gruyère and Parmesan cheese adds a salty, nutty complexity that is simply irresistible. This isn’t just a breakfast; it’s an experience. It’s one of those perfect Breakfast Foods To Share, a generous, comforting bake that easily serves a crowd and fills the whole house with an incredible aroma. Preparing it on Christmas Eve has become a cherished ritual, a quiet moment of preparation before the joyful storm of Christmas Day, ensuring the morning is as stress-free as it is delicious.

Ingredients for the Perfect Christmas Breakfast Casserole

• 1 lb pork breakfast sausage
• 1 large yellow onion, chopped
• 1 (1-pound) loaf of sourdough bread, cut into 1-inch cubes (preferably a day or two old)
• 2 cups shredded Gruyère cheese
• 1/2 cup grated Parmesan cheese
• 8 large eggs
• 2 cups whole milk
• 1 cup heavy cream
• 1 tablespoon Dijon mustard
• 1 teaspoon salt
• 1/2 teaspoon black pepper
• 1/4 teaspoon ground nutmeg

Step-by-Step Instructions

1. Brown the Sausage and Onion: In a large skillet over medium-high heat, cook the pork sausage and chopped onion. Use a wooden spoon to break the sausage into small crumbles as it cooks. Continue cooking until the sausage is thoroughly browned and the onion is soft and translucent, about 8-10 minutes. Drain off any excess grease from the pan and set the mixture aside.
2. Layer the Casserole Base: In a very large bowl, combine the slightly stale sourdough bread cubes, the cooked sausage and onion mixture, the shredded Gruyère, and the grated Parmesan. Gently toss everything together until it’s evenly distributed. Transfer this mixture into a 9×13-inch baking dish that you’ve greased with butter or nonstick spray. Spread it out into an even layer.
3. Whisk the Egg Custard: In the same large bowl (no need to wash it!), whisk together the eggs, whole milk, heavy cream, Dijon mustard, salt, pepper, and ground nutmeg. Whisk vigorously until the mixture is smooth, completely combined, and slightly frothy. The Dijon mustard and nutmeg are key to adding a subtle warmth and depth to these Savory Breakfast Casseroles.
4. Pour and Chill Overnight: Carefully and evenly pour the egg custard over the bread and sausage mixture in the baking dish. Gently press down on the bread with a spatula to ensure the top layer gets saturated. Cover the dish tightly with plastic wrap or foil and refrigerate for at least 8 hours, but preferably overnight. This resting period is crucial for the bread to absorb the custard, which results in a perfectly textured casserole.
5. Prepare for Baking: The next morning, preheat your oven to 350°F (175°C). Remove the casserole from the refrigerator and let it sit at room temperature for about 30 minutes. This helps take the chill off and promotes more even baking.
6. Bake to Golden Perfection: Bake the casserole, uncovered, for 50 to 60 minutes. You’ll know it’s done when the top is beautifully golden brown and puffy, and the center is set (a knife inserted into the middle should come out clean). Let the casserole rest on a wire rack for at least 10 minutes before slicing and serving. This allows it to set up, making it easier to cut into clean portions.

Tips & Tricks for Your Martha Stewart Christmas Breakfast Casserole

Over the years, I’ve learned a few things that take this Martha Stewart Christmas Breakfast Casserole from great to absolutely unforgettable. First and foremost, don’t underestimate the power of stale bread. Using a loaf of sourdough that’s a day or two old is a game-changer. Fresh, soft bread can turn mushy when it soaks in the custard, but slightly dry, sturdy cubes will absorb the liquid perfectly while maintaining their structure, giving you a wonderful chewy texture in the final bake. If your bread is fresh, you can cut it into cubes and leave them out on the counter for a few hours or toast them lightly in the oven at a low temperature to dry them out. This single step is the best defense against a soggy casserole bottom.

Another crucial tip is to resist the urge to bake it straight from the fridge. That 30-minute rest on the counter is more important than it seems. Putting a cold glass or ceramic dish into a hot oven can risk thermal shock (cracking the dish), but it also ensures the casserole bakes evenly. A stone-cold center will take much longer to cook through, potentially leading to an overcooked, dry exterior and an undercooked, runny middle. This simple pause allows the chill to come off the dish, so the heat can penetrate to the center more effectively, resulting in a perfectly set, golden-brown bake from edge to edge. It’s a small detail that makes a huge difference, especially when you’re looking for Easy Breakfast Dishes For A Crowd that turn out perfectly every time.

Why did my casserole turn out dry?

A dry breakfast casserole is often the result of an incorrect bread-to-custard ratio or overbaking. Ensure you use a full 1-pound loaf of bread, as skimping on it can leave too much unabsorbed custard. It’s also vital not to skip the overnight chilling step; this is when the bread truly soaks up the liquid. When baking, start checking for doneness at the 50-minute mark. The center should be just set, not jiggly, but you don’t want to bake it until it’s rock-solid. A little residual heat will continue to cook it as it rests. Following these steps will ensure a moist, flavorful result every time.

Simple Substitutions & Flavor Variations

While this recipe is a classic, it’s also wonderfully adaptable, making it a versatile Christmas Brunch Recipe. You can easily tailor it to your family’s preferences or what you have on hand. If pork sausage isn’t your favorite, feel free to substitute it with cooked and crumbled bacon, diced ham (a great way to use up holiday leftovers), or even spicy chorizo for a kick. For a vegetarian option, a plant-based breakfast sausage works beautifully, or you can use a pound of sautéed mushrooms and spinach for an earthy, savory flavor. Just be sure to cook the spinach down and squeeze out all the excess moisture to avoid a watery casserole.

The cheese is another area ripe for customization. Gruyère provides a distinct nutty flavor, but a sharp white cheddar, Monterey Jack, or even a smoked Gouda would be delicious alternatives. You can also play with the aromatics. Add a pinch of red pepper flakes to the sausage for some heat, or stir a tablespoon of fresh herbs like thyme, sage, or chives into the egg custard. For a richer flavor, try using brioche or challah bread instead of sourdough; they’ll create a softer, more decadent texture. These variations allow you to put your own spin on the dish, turning it into a signature bake that can be enjoyed as a main course or as part of a spread of Savory Breakfast Snacks.

Can I add vegetables to this casserole?

Absolutely! Adding vegetables is a fantastic way to add more flavor, color, and nutrients. Sautéed bell peppers, mushrooms, and spinach are excellent additions. The key is to always cook your vegetables before adding them to the casserole and to drain any excess liquid. Raw vegetables will release too much water during baking, which can make the final dish soggy. Cook them along with the sausage and onion mixture for an easy one-pan prep.

Frequently Asked Questions

Can I make this Martha Stewart Christmas Breakfast Casserole ahead of time?

Yes, this recipe is specifically designed to be made ahead! You can assemble the entire casserole the day before, cover it, and let it chill in the refrigerator overnight. This not only saves you a tremendous amount of time on a busy morning but also improves the texture of the dish by allowing the bread to fully absorb the egg custard.

How do I know when the casserole is fully cooked?

The casserole is done when the top is golden brown and puffy and the center is set. The most reliable test is to insert a knife or a skewer into the very center of the casserole. If it comes out clean, without any wet egg mixture clinging to it, the casserole is ready. The internal temperature should be at least 160°F (71°C).

What should I serve with this Christmas breakfast casserole?

This savory casserole pairs wonderfully with a variety of side dishes. For a complete holiday breakfast or brunch, consider serving it with a fresh fruit salad, a simple green salad with a vinaigrette, or some roasted asparagus. A side of crispy bacon or a warm basket of pastries also complements it nicely. And of course, don’t forget the coffee and orange juice!

How do I store and reheat leftovers?

Store any leftover casserole tightly covered in the refrigerator for up to 3 days. To reheat, you can warm individual slices in the microwave for about 60-90 seconds. For larger portions, it’s best to reheat it in an oven-safe dish at 325°F (165°C) for 15-20 minutes, or until warmed through. Covering it with foil will prevent the top from getting too dark.

A Christmas Morning Tradition Worth Sharing

There is something deeply satisfying about pulling this golden, puffy Martha Stewart Christmas Breakfast Casserole from the oven while the family is gathered, sleepy-eyed and excited. It’s a dish that commands the table, filling the room with the comforting smells of sausage, cheese, and toasted bread. It represents the best kind of holiday cooking: impressive and delicious, yet simple and stress-free. By preparing it the night before, you give yourself the gift of time, allowing you to be part of the memories being made instead of just facilitating them from the kitchen. It’s truly one of the best Christmas Morning Casserole Recipes for that reason alone.

This casserole is more than just a recipe; it’s a tradition in the making. It’s perfect for a crowd, making it one of my go-to Breakfast Ideas For 10 People. Whether you’re hosting a big family brunch or simply want a special meal for your immediate family on Christmas morning, this dish delivers comfort and joy in every single bite. I encourage you to give it a try this holiday season. Let it become the warm, savory centerpiece of your celebration, a dish that allows you to relax and savor the magic of the morning. Save it, share it, and make it your own.

Martha Stewart Christmas Breakfast Casserole

This make-ahead Martha Stewart Christmas Breakfast Casserole is the perfect way to ensure a relaxed and delicious holiday morning. The rich flavors of sausage, nutty Gruyère, and tangy sourdough meld together overnight, creating a luxurious and homey centerpiece for any brunch. It’s an elegant, simple, and comforting dish that easily serves a crowd and fills the house with an incredible aroma.

Print Recipe Pin Recipe

Prep Time 20 minutes mins

Cook Time 1 hour hr

Total Time 9 hours hrs 20 minutes mins

Servings: 8 servings

Calories: 300

Ingredients Equipment Method Notes

Ingredients

  

Ingredients

• 1 lb pork breakfast sausage
• 1 large yellow onion, chopped
• 1 (1-pound) loaf of sourdough bread, cut into 1-inch cubes (preferably a day or two old)
• 2 cups shredded Gruyère cheese
• 1/2 cup grated Parmesan cheese
• 8 large eggs
• 2 cups whole milk
• 1 cup heavy cream
• 1 tablespoon Dijon mustard
• 1 teaspoon salt
• 1/2 teaspoon black pepper
• 1/4 teaspoon ground nutmeg

Equipment

• Large skillet
• Wooden spoon
• Very large bowl
• 9×13 inch baking dish
• Whisk
• Spatula
• Plastic wrap or foil
• Wire rack

Method

 

Instructions

1. Brown the Sausage and Onion: In a large skillet over medium-high heat, cook the pork sausage and chopped onion. Use a wooden spoon to break the sausage into small crumbles as it cooks. Continue cooking until the sausage is thoroughly browned and the onion is soft and translucent, about 8-10 minutes. Drain off any excess grease from the pan and set the mixture aside.
2. Layer the Casserole Base: In a very large bowl, combine the slightly stale sourdough bread cubes, the cooked sausage and onion mixture, the shredded Gruyère, and the grated Parmesan. Gently toss everything together until it’s evenly distributed. Transfer this mixture into a 9×13-inch baking dish that you’ve greased with butter or nonstick spray. Spread it out into an even layer.
3. Whisk the Egg Custard: In the same large bowl (no need to wash it!), whisk together the eggs, whole milk, heavy cream, Dijon mustard, salt, pepper, and ground nutmeg. Whisk vigorously until the mixture is smooth, completely combined, and slightly frothy.
4. Pour and Chill Overnight: Carefully and evenly pour the egg custard over the bread and sausage mixture in the baking dish. Gently press down on the bread with a spatula to ensure the top layer gets saturated. Cover the dish tightly with plastic wrap or foil and refrigerate for at least 8 hours, but preferably overnight. This resting period is crucial for the bread to absorb the custard.
5. Prepare for Baking: The next morning, preheat your oven to 350°F (175°C). Remove the casserole from the refrigerator and let it sit at room temperature for about 30 minutes. This helps take the chill off and promotes more even baking.
6. Bake to Golden Perfection: Bake the casserole, uncovered, for 50 to 60 minutes. You’ll know it’s done when the top is beautifully golden brown and puffy, and the center is set (a knife inserted into the middle should come out clean). Let the casserole rest on a wire rack for at least 10 minutes before slicing and serving.

Notes

For best results, use day-old or slightly stale sourdough bread to prevent a mushy texture; you can toast fresh bread cubes lightly to dry them out. It is crucial to let the assembled casserole sit at room temperature for 30 minutes before baking to ensure it cooks evenly. The casserole is done when a knife inserted into the center comes out clean.