There’s a certain joy that comes from waking up to the smell of a warm, home-cooked meal, especially when it’s something as delightful as an Overnight Croissant Breakfast Casserole. Imagine the rich aroma of buttery croissants melding with the savory scent of sausage and melted cheese—it’s enough to make anyone leap out of bed. This dish is not just a breakfast; it’s a crowd-pleaser that effortlessly impresses family and friends alike, taking you from routine morning meals to a gourmet experience.
I discovered this recipe during a lazy Sunday breakfast when I wanted to treat my loved ones without spending hours in the kitchen. Its secret? You prepare it the night before, leaving you free to savor your morning coffee while it bakes to golden perfection. With layers of flaky croissants and creamy goodness, this casserole is not only delicious but also exceptionally easy, perfect for those overrun by the fast-food grind. Let’s dive into this delightful recipe that promises to transform your breakfast game!
Why You'll Love This Overnight Croissant Breakfast Casserole
- This Overnight Croissant Breakfast Casserole is incredibly easy to prepare, allowing you to assemble it the night before and enjoy a stress-free morning.
- The combination of buttery croissants, savory sausage, and melted cheese creates a flavor explosion that will have everyone coming back for seconds.
- Its versatility makes it perfect for any occasion, whether it’s a cozy family brunch or a festive holiday gathering.
- The alluring golden-brown top not only looks stunning but also adds to the overall appeal, making it a visually satisfying centerpiece on your breakfast table.
Overnight Croissant Breakfast Casserole Ingredients
Get ready for a flavorful start to your day with this Overnight Croissant Breakfast Casserole!
For the Base
- 4 large butter croissants – these add a rich, buttery flavor that enhances the whole dish.
- 1 lb breakfast sausage – use mild for a balanced taste or spicy for a kick!
- 1 small onion – finely chopped for a sweet, aromatic depth.
- 1 c shredded cheddar cheese – this provides a creamy richness that melts beautifully.
For the Egg Mixture
- 6 large eggs – the foundation of your casserole that binds everything together.
- 1/2 c heavy whipping cream – adds luxurious creaminess and richness to your egg base.
- 3 c whole milk – keep it divided; you’ll need some for the gravy later!
- 1/2 tsp dry mustard powder – a little tang that brightens the flavors up.
- 1/2 tsp salt – remember to add more to taste when making gravy.
- 1/2 tsp black pepper – adds seasoning; adjust more in your gravy as preferred.
- 1/4 tsp paprika – for a subtle smokiness and beautiful color.
- 1/4 tsp garlic powder – enhances the savory profile without overwhelming the dish.
For the Gravy
- 2 tbsp butter – a must for a silky gravy base.
- 3 tbsp all-purpose flour – helps thicken the gravy to the perfect consistency.
By gathering these essential ingredients for the Overnight Croissant Breakfast Casserole, you’re just steps away from creating a breakfast masterpiece that’ll delight your family!

How to Make Overnight Croissant Breakfast Casserole
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Sauté Onions: Heat olive oil in a skillet over medium heat. Add the chopped onions and sauté them until they become soft and translucent, about 5 minutes.
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Brown the Sausage: Add the breakfast sausage to the skillet. Cook it until browned and crumbly, then drain the fat, saving a bit for the gravy. Let the mixture cool slightly.
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Combine Ingredients: Tear the croissants into bite-sized pieces and place them in a large bowl. Add the sausage mixture and shredded cheddar cheese. Toss gently to combine all the ingredients.
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Prepare the Baking Dish: Spread the croissant mixture evenly into a greased 9×13-inch baking dish, ensuring it’s well distributed to create a delicious base.
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Make the Egg Mixture: In a separate bowl, whisk together the eggs, heavy whipping cream, half a cup of milk, and the spices until well combined. Pour this mixture evenly over the croissant mixture in the baking dish.
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Refrigerate Overnight: Cover the dish with plastic wrap or aluminum foil and refrigerate it overnight to let the flavors meld together.
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Bake to Perfection: When ready to bake, preheat the oven to 350°F (175°C). Remove the cover and bake the casserole for 35 to 45 minutes, or until the top is golden brown and set.
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Prepare the Gravy: While the casserole is baking, melt butter in a saucepan with the reserved sausage fat over medium heat. Stir in the flour, then gradually whisk in 2½ cups of milk. Cook until thickened and season with salt and pepper to taste.
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Serve and Enjoy: Once baked, let the casserole cool slightly. Slice and serve hot with the creamy gravy on the side for drizzling.
Optional: Garnish with fresh herbs like chives or parsley for an added touch of flavor and color.
Exact quantities are listed in the recipe card below.
How to Store and Freeze Overnight Croissant Breakfast Casserole
Fridge: Store leftover casserole in an airtight container for up to 3 days. Reheat slices in the microwave or oven to retain texture.
Freezer: For long-term storage, freeze unbaked casserole before refrigeration. Cover tightly with foil or plastic wrap, and it will keep for up to 2 months.
Reheating: If frozen, thaw overnight in the fridge, then bake at 350°F (175°C) for about 30-40 minutes. Ensure it’s heated through and slightly golden on top for the best flavor.
Tips: Avoid freezing after baking, as the croissants may become soggy upon reheating. Enjoy your Overnight Croissant Breakfast Casserole fresh for the ultimate experience!
Overnight Croissant Breakfast Casserole Variations
Feel free to get creative and make this casserole your own with these delightful variations!
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Veggie-Packed: Add spinach, bell peppers, or mushrooms to the sausage mixture for a burst of color and nutrition. This twist not only enhances the flavor but also increases the veggie goodness for a balanced breakfast.
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Cheese Swap: Try using gouda or pepper jack cheese instead of cheddar for a different flavor profile. These cheeses melt beautifully and add a unique twist that your family will love.
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Gluten-Free: Substitute gluten-free croissants or bread for a gluten-free version that doesn’t compromise on flavor. Make sure to adjust the cooking time to ensure it’s baked to perfection.
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Sweet & Savory: Drizzle a little maple syrup over the top before baking for a sweet contrast that pairs wonderfully with the savory sausage. This sweet addition brings a delightful balance to every bite.
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Spicy Kick: Add diced jalapeños or a dash of hot sauce to the egg mixture for an extra layer of heat. A little spice can elevate the dish and awaken your taste buds!
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Creamy Mushroom Gravy: Swap out traditional gravy for a creamy mushroom sauce by sautéing mushrooms with the onions. This variation provides a rich and earthy flavor that complements the casserole beautifully.
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Herb Infusion: Mix in fresh herbs like thyme or rosemary into the egg mixture for an aromatic twist. The fresh herbs provide a delightful punch of flavor and elevate the breakfast experience.
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Savory Toppings: Top the baked casserole with crispy fried onions or crumbled bacon before serving. Adding a crunchy topping creates a delightful textural contrast and enhances the overall flavor profile.
Make Ahead Options
These Overnight Croissant Breakfast Casserole preparations are perfect for busy home cooks looking to save time without sacrificing flavor. You can assemble the entire casserole up to 24 hours in advance—simply follow the recipe up until the refrigeration step. Cover the dish tightly with plastic wrap or aluminum foil to prevent drying out, ensuring it stays just as delicious whenever you’re ready to bake. When you’re set to serve, remove it from the fridge, preheat the oven to 350°F (175°C), and bake for 35 to 45 minutes until golden brown on top. Enjoy a hassle-free morning with this delightful, make-ahead breakfast option!
What to Serve with Overnight Croissant Breakfast Casserole?
Start your morning right and create an unforgettable meal experience that ticks all the boxes for flavor and warmth.
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Fresh Fruit Salad: A vibrant mix of seasonal fruits adds a refreshing contrast to the rich casserole, balancing the savory flavors beautifully. Think juicy strawberries, blueberries, and zesty citrus to awaken your palate.
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Crispy Bacon: The smoky crunch of bacon complements the soft, buttery casserole perfectly, providing a delightful texture and flavor combination that breakfast lovers crave.
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Maple Syrup Drizzle: Hand in hand with the savory elements, a light drizzle of maple syrup offers a sweet contrast that enhances the overall dish. It’s a sweet twist to elevate your breakfast experience.
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Herbed Yogurt Parfait: Creamy Greek yogurt layered with honey and fresh herbs brings a lightness that cuts through the richness of the casserole, adding a layer of sophistication to your morning.
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Coffee or Tea: A steaming cup of your favorite brew pairs perfectly with the casserole, encouraging slow mornings and conversation amongst family and friends as they enjoy every bite together.
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Savory Scones: Flaky, herb-infused scones are a delightful addition, providing a wonderful texture that complements the casserole while offering a satisfying bite as you savor each morsel.
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Vegetable Frittata: A light vegetable frittata not only brightens the plate with colors but also adds wholesome elements that harmonize with the Overnight Croissant Breakfast Casserole’s richness. Perfect for those who love veggie-filled delights!
Chef's Helpful Tips
- For the Overnight Croissant Breakfast Casserole, ensure your croissants are fresh or slightly stale to absorb the egg mixture better without becoming too soggy.
- When sautéing the onions, resist the urge to rush; cook them gently until they are soft and translucent for the best flavor.
- Mix your eggs and cream thoroughly before pouring over the croissants to avoid any separated layers in the casserole.
- Allow the dish to chill overnight to give the croissants time to soak up the flavors, and don’t skip preheating the oven to exactly 350°F for even cooking.
Overnight Croissant Breakfast Casserole Recipe FAQs
How do I choose the best croissants for this recipe?
Absolutely! For the Overnight Croissant Breakfast Casserole, I recommend using fresh butter croissants since they offer a rich flavor and excellent texture. If you can find slightly stale croissants, those work well too; they will absorb the egg mixture better without becoming too soggy. Look for croissants that are golden brown with a light, flaky exterior, as this indicates freshness.
How should I store leftovers?
Very important! Store any leftovers in an airtight container in the fridge for up to 3 days. To reheat, simply pop slices in the microwave, or place them in a preheated oven at 350°F (175°C) until warmed through, which helps retain the casserole’s delightful texture.
Can I freeze the casserole?
Certainly! For freezing the Overnight Croissant Breakfast Casserole, wrap it tightly in plastic wrap or foil before refrigerating it overnight. It can freeze for up to 2 months. When you’re ready to enjoy it, thaw it overnight in the fridge. Once thawed, bake it at 350°F (175°C) for about 30 to 40 minutes, until it’s heated through and slightly golden on top.
What should I do if the casserole is soggy after baking?
To avoid a soggy casserole, ensure your croissants are either fresh or slightly stale and remember to let it chill overnight. If you find your casserole soggy after cooking, it might be due to excess moisture. Try baking it slightly longer or at a higher temperature for the last few minutes to help evaporate that excess liquid and firm it up.
Is this casserole safe for people with dietary restrictions?
Always a good consideration! The Overnight Croissant Breakfast Casserole contains gluten, dairy, and eggs, so it’s not suitable for those with gluten intolerance or dairy allergies. For a gluten-free version, consider using gluten-free croissants and an alternative milk. If you have a dairy allergy, you can use dairy-free milk options and replace heavy cream with coconut cream for a creamy texture. Always check labels to ensure all ingredients meet your dietary needs.
Can I add vegetables to this casserole?
Absolutely! The more the merrier! Feel free to add sautéed veggies like bell peppers, spinach, or mushrooms to the sausage mixture for extra nutrition and flavor. Ensure they’re well-cooked and cooled before combining with the other ingredients to prevent excess moisture from making the casserole soggy. Enjoy experimenting with different flavor combinations!

Overnight Croissant Breakfast Casserole
Ingredients
Equipment
Method
- Heat olive oil in a skillet over medium heat. Add chopped onions and sauté until soft and translucent, about 5 minutes.
- Add breakfast sausage to the skillet, cooking until browned and crumbly, then drain fat.
- Tear croissants into bite-sized pieces and place in a large bowl. Add sausage mixture and shredded cheddar cheese, tossing gently.
- Spread croissant mixture evenly into a greased 9x13-inch baking dish.
- In a separate bowl, whisk together the eggs, heavy cream, and 1/2 cup milk with spices until combined. Pour over the croissant mixture.
- Cover with plastic wrap or foil and refrigerate overnight.
- Preheat the oven to 350°F. Remove cover and bake for 35 to 45 minutes until golden brown.
- Melt butter in a saucepan with reserved sausage fat over medium heat, stir in flour, then gradually whisk in 2½ cups of milk until thickened.
- Once baked, let cool slightly, slice, and serve hot with creamy gravy.




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