This breakfast casserole is a buttery, cheesy delight that’s incredibly easy to make. Perfect for feeding a crowd, it brings comfort to your mornings and is sure to become a family favorite.
Table of Contents

Ingredients for Breakfast Casserole
Key Ingredients Overview
This simple breakfast casserole starts with 6-8 medium-sized croissants, which provide a flaky, buttery base. You’ll need 4 large eggs and 1 cup of half and half or whole milk to create a creamy custard. A splash of Dijon mustard adds a subtle depth of flavor, while a pinch of salt enhances the savory notes. For protein, include 8 ounces of deli or leftover ham, cut into thirds, and 6 ounces of shredded Swiss or Gruyere cheese for that melty goodness. Finally, a dusting of powdered sugar brings a touch of sweetness to each serving.
Optional Ingredients for Variation
Feel free to customize your breakfast casserole! You can swap croissants for bread or even bagels. Consider adding vegetables like spinach or bell peppers for a health boost. You can also experiment with different cheeses or incorporate spices like paprika for an extra kick.
Why This Breakfast Casserole is a Must-Try
Flavor Profile and Texture
This breakfast casserole is a delightful combination of buttery, cheesy, and savory flavors, with a hint of sweetness from the powdered sugar. The texture is soft and fluffy, thanks to the croissants soaking up the creamy custard, creating a comforting dish that fills your home with warmth.
Perfect for Meal Prep and Gatherings
Not only is this recipe simple, but it’s also meal prep-friendly. You can prepare it ahead of time and refrigerate it overnight. It’s perfect for brunch gatherings or busy mornings when you want something delicious without a lot of fuss.

How to Prepare the Breakfast Casserole
Step-by-Step Instructions
- Preheat the oven to 350°F (175°C).
- Lightly grease a 9×6-inch or 9×11-inch baking dish with cooking spray.
- Tear the croissants in half and arrange them in the prepared dish. Cut the ham into thirds and distribute it among the croissants. Top with shredded cheese.
- In a separate bowl, whisk together the eggs, half and half (or milk), Dijon mustard, and salt. Pour this mixture over the croissants.
- Cover the dish with foil and refrigerate for 30 minutes or overnight to allow the bread to soak up the egg mixture.
- Bake the covered casserole in the preheated oven for 20 minutes. Remove the foil and continue baking for an additional 10 to 15 minutes until the top is golden and the casserole is hot and bubbly.
- Let the casserole rest for 5 minutes before dusting with powdered sugar and serving.
Tips for Optimal Flavor
For the best flavor, allow your casserole to soak overnight. This helps the croissants absorb the egg mixture fully. When baking, keep an eye on it to prevent over-browning; every oven is different!
How to Store and Reheat Leftovers
Refrigeration Tips
Store any leftover breakfast casserole in an airtight container in the refrigerator for up to a week. It makes a fantastic quick breakfast option on busy mornings!
Freezing Instructions
If you want to enjoy your breakfast casserole later, wrap it tightly in plastic or foil and freeze for up to 3 months. To reheat, thaw in the fridge overnight and warm it up in the oven or microwave.
Serving Suggestions for Breakfast Casserole
Garnishes and Additions
For a beautiful presentation, consider dusting your casserole with powdered sugar just before serving. Fresh fruit or a side of yogurt can also complement the dish beautifully.
What to Pair with Your Casserole
This breakfast casserole pairs wonderfully with a fresh fruit salad or a steaming cup of coffee. For a heartier brunch, try it alongside classic favorites like bacon or sausage links.
FAQs
What ingredients are commonly used in a breakfast casserole?
Common ingredients in a breakfast casserole include eggs, milk or cream, bread, cheese, and various proteins like ham or sausage. Vegetables can also be added for extra flavor and nutrition.
How do I make a breakfast casserole in advance?
To make a breakfast casserole in advance, prepare the dish as instructed and refrigerate it overnight before baking. This allows the bread to soak up the egg mixture for enhanced flavor.
What are some tips for making a breakfast casserole healthier?
To make a breakfast casserole healthier, use whole grain bread, reduce the amount of cheese, and add more vegetables. You can also substitute egg whites for whole eggs.
Can I freeze leftover breakfast casserole for later?
Yes, you can freeze leftover breakfast casserole. Wrap it tightly in plastic or foil and store it in the freezer for up to 3 months. Thaw in the refrigerator before reheating.
What are some popular variations of breakfast casserole recipes?
Popular variations include using different types of bread like bagels or sourdough, incorporating different cheeses, or adding ingredients like spinach, bell peppers, or chorizo for extra flavor.
Related Recipes to try
- Amazing Egg Tater Tot Breakfast Casserole
- Cowboy Casserole
- Mac and Cheese Meatloaf Casserole: The Ultimate Comfort Food Mashup
- Sausage French Toast Roll-Ups Recipe
- Cheesy Potato Burritos: Comfort Meal
Conclusion
This breakfast casserole is an indulgent dish that’s sure to impress your family and friends. For additional inspiration, check out amazing recipes on Pinterest. Whether enjoyed on a weekend or for a special occasion, it’s a perfect way to start the day!

Indulgent Breakfast Casserole: A Family Favorite
Equipment
- baking dish
- whisk
- cooking spray
Ingredients
- 6-8 medium-sized croissants
- 4 large eggs
- 1 cup half and half or whole milk
- 1 ½ tablespoons Dijon mustard
- pinch salt
- 8 ounces deli or leftover ham about 6 thin slices
- 6 ounces shredded Swiss or Gruyere cheese
- Powdered sugar for serving
Instructions
- Preheat the oven to 350°F (175°C).
- Grease a baking dish with cooking spray and arrange torn croissants inside.
- Distribute cut ham and top with shredded cheese.
- Whisk eggs, half and half, mustard, and salt, then pour over croissants.
- Cover and refrigerate for 30 minutes or overnight.
- Bake covered for 20 minutes, then uncover and bake for an additional 10-15 minutes until golden.
- Let rest for 5 minutes before dusting with powdered sugar and serving.




