Overnight Croissant Breakfast Casserole (Easy Make-Ahead Recipe)
Make this overnight croissant breakfast casserole with buttery croissants, eggs, and cheese. Easy make-ahead recipe perfect for brunch or holidays!
Equipment
- Large mixing bowl
- Whisk
- Cutting board and knife
- 9x13-inch baking dish
- Aluminum foil
Ingredients
- 6 large croissants (day-old preferred), torn into chunks
- 8 large eggs
- 2 cups milk (or half-and-half for richer custard)
- 1 cup shredded cheese (cheddar, Gruyère, or mozzarella)
- 1 cup cooked ham, bacon, or sausage (optional)
- 1 cup vegetables (spinach, mushrooms, peppers)
- Salt and pepper to taste
- Fresh herbs for garnish (optional)
Instructions
- Prepare croissants: Tear croissants into chunks and place in a greased baking dish.
- Whisk custard: In a bowl, whisk eggs, milk, salt, pepper, and seasonings.
- Layer ingredients: Scatter cheese, meats, and vegetables over croissants. Pour custard evenly over the top.
- Refrigerate overnight: Cover with foil or plastic wrap. Chill for 8–12 hours.
- Bake: Preheat oven to 350°F (175°C). Cover casserole with foil and bake for 30 minutes. Remove foil and bake another 15 minutes until golden and set.
- Serve: Let rest for 5 minutes before serving. Garnish with herbs if desired.
- Expert Tip: Cover with foil during the first half of baking to prevent over-browning while ensuring the custard cooks evenly.
Notes
- Day-old croissants absorb custard better.
- Whole wheat croissants and reduced-fat cheese make a lighter version.
- Add extra vegetables for nutrition and flavor.
- Freeze baked portions for up to 1 month; reheat in oven.
- Perfect for holidays, brunches, or meal prep.