Easy Sausage Croissant Breakfast Casserole (Make-Ahead Brunch!)

There’s nothing quite like waking up to the smell of a warm, Sausage Croissant Breakfast Casserole baking in the oven.

This savory dish is rich, cheesy, and ultra-comforting—perfect for holiday mornings, brunch with friends, or lazy weekends at home.

Why You’ll Love This Recipe

The ultimate make-ahead breakfast for busy mornings

Buttery croissants soak up the creamy egg mixture like a dream

Packed with savory sausage and melted cheddar in every bite

Feeds a crowd with minimal effort

Great for brunch, potlucks, or meal prep

What You’ll Need (Ingredient Highlights)

Croissants: Use 6 large ones, preferably a day old.

They soak up the egg mixture without getting mushy.

Breakfast sausage: Cooked and crumbled for that hearty, savory flavor.

Cheddar cheese: Sharp cheddar melts beautifully into the layers.

Eggs and milk: The creamy custard base that ties everything together.

Dry mustard, salt, and pepper: Simple seasonings that elevate the dish.

Pro Tips Before You Start

Lightly toast your croissants if they’re too soft for better texture.

Let the assembled casserole sit overnight for the best flavor and texture.

Use freshly grated cheese—it melts better than pre-shredded!

Don’t skip the dry mustard; it adds subtle depth to the custard.

How to Make Sausage Croissant Breakfast Casserole

Step 1: Prepare the Baking Dish
Grease a 9×13-inch baking dish and evenly layer in the croissant pieces.

Step 2: Add the Filling
Sprinkle cooked, crumbled sausage and shredded cheddar cheese evenly over the croissants.

Step 3: Make the Egg Custard
In a large mixing bowl, whisk together the eggs, milk, dry mustard, salt, and pepper until smooth.

Step 4: Assemble and Soak
Pour the custard mixture evenly over the croissant-sausage-cheese layers.

Press down lightly to help the croissants absorb the liquid.

Step 5: Chill
Cover the dish with plastic wrap and refrigerate for at least 2 hours or overnight.

Step 6: Bake
Preheat your oven to 350°F (175°C).

Let the casserole sit at room temperature while the oven preheats.

Bake uncovered for 40–45 minutes, until the top is golden and the center is set.

Step 7: Cool and Serve
Allow to cool slightly before slicing. Serve warm and enjoy!

What to Serve It With

A fresh fruit salad or citrus slices

Hot coffee or a breakfast mimosa

A side of roasted potatoes or hash browns

Yogurt and granola for a brunch spread

Variations / Substitutions

Switch the meat: Use cooked bacon, ham, or turkey sausage instead.

Add veggies: Bell peppers, spinach, or sautéed mushrooms are great mix-ins.

Use a different cheese: Try Swiss, Monterey Jack, or pepper jack for variety.

Make it spicy: Add a pinch of red pepper flakes or use spicy sausage.

Storage & Leftovers

Refrigerator: Store leftovers in an airtight container for up to 4 days.

Reheat: Warm in the microwave or a 325°F oven until heated through.

Freezer: Freeze individual slices in plastic wrap + foil for up to 2 months.

Thaw overnight in the fridge and reheat before serving.

FAQs

Can I make this without refrigerating overnight?
Yes! You can bake it after letting it soak for at least 2 hours, but overnight gives the best flavor.

Can I use store-bought croissants?
Absolutely! Bakery or grocery store croissants work well.

What type of sausage is best?
Pork breakfast sausage gives the classic flavor, but turkey sausage also works.

Can I make this dairy-free?
You can use plant-based milk and cheese, but results may vary in texture.

Why is my casserole soggy?
It may need more baking time, or the croissants weren’t dry enough.

Try using slightly stale croissants next time.

Can I halve this recipe?
Yes! Use an 8×8-inch pan and halve all ingredients for a smaller batch.

Final Thoughts

This Sausage Croissant Breakfast Casserole is a guaranteed crowd-pleaser.

With buttery croissants, savory sausage, and melty cheddar in every bite, it’s the kind of cozy comfort food that brings everyone to the table.

Whether for holiday brunch or just a weekend treat, it’s always a hit!