Breakfast Croissant Casserole

Name: Breakfast Croissant Casserole
Prep time: 20 min
Cook time: 45 min
Total time: 1 h 5 min
Yield: 8 servings
Ingredients: 4 large croissants, torn into pieces; 6 large eggs; 2 cups milk; 1 cup shredded cheese (e.g., cheddar or Swiss); 1 cup diced ham or cooked bacon; 1 cup diced bell peppers (optional); 1 teaspoon salt; 1/2 teaspoon black pepper; 1 tablespoon fresh herbs (e.g., parsley or chives)

Highlighted under: Daily Cooking

When I first made this Breakfast Croissant Casserole, I was pleasantly surprised by the delightful mix of flavors and textures. The buttery croissants soak up the creamy egg mixture beautifully while baking, creating a dish that’s both light and indulgent. Perfect for brunch gatherings or a lazy Sunday morning, this casserole brings a touch of sophistication to breakfast with minimal effort. I love how it can be prepared the night before, allowing all the ingredients to meld together, creating a richer flavor come morning.

Created by

Arden Whitlock

Last updated on 2026-02-01T18:53:35.553Z

One morning, I decided to transform my leftover croissants into something special. Experimenting with simple ingredients like eggs, cheese, and vegetables, I created this easy casserole that instantly became a family favorite. Baking it brought out an incredible aroma that filled the kitchen, making everyone excited for breakfast.

I found that letting the casserole sit overnight allows the croissants to fully absorb the egg mixture, resulting in a richer flavor. Topped with a sprinkle of fresh herbs before serving, it truly elevates this dish to a brunch-worthy treat!

Why You Will Love This Recipe
Buttery croissants transform into a creamy, decadent dish
Easily customized with your favorite fillings or toppings
Perfect for feeding a crowd with minimal fuss

Ingredient Insights

The croissants are the star of this dish, providing a flaky, buttery base that absorbs the creamy egg mixture. When selecting croissants, freshness is key; day-old croissants work beautifully as they are slightly stale and soak up the egg custard without turning mushy. If you prefer a sweeter version, you can opt for chocolate or almond croissants, which will add a delightful twist to the casserole.

The choice of cheese plays a significant role in the casserole's flavor profile. Cheddar brings a sharp tanginess, while Swiss offers a smoother, nuttier taste. For an extra layer of flavor, consider mixing cheeses; a combination of cheese types adds complexity and richness. Additionally, feel free to experiment with smoked gouda or pepper jack for a bolder taste.

Make-Ahead and Storage Tips

This Breakfast Croissant Casserole is incredibly convenient for meal prepping. To make it ahead of time, assemble the casserole the night before and store it in the refrigerator. This allows the croissants to soak up the egg mixture fully, enhancing the flavor. Just cover it tightly with plastic wrap to prevent it from drying out. In the morning, simply bake it straight from the fridge; you may need to add an additional 5-10 minutes to the baking time.

Leftover casserole can be stored in the refrigerator for up to three days. To reheat, slice individual portions and place them in the microwave, heating for 30-60 seconds until warmed through. Alternatively, you can reheat in a 350°F (175°C) oven for about 15 minutes. If you're looking to freeze this dish, cut it into portions and wrap them tightly. It can be frozen for up to two months, making it a fantastic option for quick breakfasts.

Ingredients

For the Casserole

4 large croissants, torn into pieces
6 large eggs
2 cups milk
1 cup shredded cheese (e.g., cheddar or Swiss)
1 cup diced ham or cooked bacon
1 cup diced bell peppers (optional)
1 teaspoon salt
1/2 teaspoon black pepper
1 tablespoon fresh herbs (e.g., parsley or chives)

Instructions

Prepare the Casserole

Preheat the oven to 350°F (175°C). In a large mixing bowl, whisk together the eggs, milk, salt, and pepper. Add the torn croissant pieces, cheese, ham or bacon, and bell peppers. Gently fold until everything is well combined.

Bake the Casserole

Pour the mixture into a greased baking dish and spread it evenly. Bake for 45 minutes or until golden brown and set in the center. Remove from the oven and let it cool slightly before serving.

Serve

Garnish with fresh herbs before slicing and serving. Enjoy warm and watch it disappear!

Pro Tips

For the best results, prepare the casserole the night before and refrigerate it. This allows the flavors to develop and makes for a quicker morning prep.

Serving Suggestions

This Breakfast Croissant Casserole is delightful on its own, but you can elevate the brunch experience with a few thoughtful sides. Consider serving it alongside a simple mixed greens salad dressed with a light vinaigrette for a refreshing balance. Fresh fruits like berries or sliced oranges add a splash of color and a sweet contrast to the savory casserole.

For a festive occasion, pair the casserole with mimosas or a rich cup of coffee. Adding a dollop of crème fraîche or a sprinkle of hot sauce can also enhance the flavor and allow guests to customize their servings. Offering a variety of toppings, such as avocado slices or pickled onions, will make serving more interactive and enjoyable.

Customization Ideas

One of the best parts about this casserole is its versatility. You can easily customize it to suit your taste preferences or dietary restrictions. For a vegetarian version, omit the ham or bacon and add more vegetables like sautéed mushrooms, spinach, or zucchini. Adding a dash of spice, such as crushed red pepper or diced jalapeños, can also bring an exciting heat to the dish.

If you're looking for a lighter version, consider using egg whites instead of whole eggs and low-fat milk. You can swap out the cheese for a lower-fat option or even a dairy-free cheese substitute. Not only will these changes make the casserole lighter, but it still retains its deliciously creamy texture while catering to different dietary needs.

Questions About Recipes

→ Can I make this casserole ahead of time?

Yes! You can prepare it the night before and refrigerate it. Just make sure to let it sit at room temperature for about 15 minutes before baking.

→ What other ingredients can I add?

Feel free to mix in your favorite vegetables, like spinach or mushrooms, or even swap the meats for something like sausage.

→ Can I use different types of bread?

Absolutely! While croissants are recommended for their buttery flavor, you could use any bread like brioche or even day-old baguette.

→ How do I store leftovers?

Leftovers can be stored in an airtight container in the fridge for up to 3 days. You can reheat it in the oven or microwave.