Wake up to the aroma of freshly baked comfort with this Overnight Croissant Breakfast Casserole. Buttery croissants are layered with creamy eggs, cheese, and savory add-ins for a golden, melt-in-your-mouth breakfast bake that’s both elegant and easy to prepare.
It’s perfect for holiday mornings, weekend brunches, or any special breakfast gathering. The best part? You can prep it the night before, pop it in the fridge, and bake it fresh in the morning!
Why You’ll Love This Recipe
- Buttery croissants make every bite extra fluffy and rich
- Easy make-ahead breakfast for stress-free mornings
- Feeds a crowd — ideal for holidays and brunch parties
- Customizable with your favorite meats, cheeses, or veggies
- Bakes up golden, cheesy, and comforting every time
Recipe Overview
Prep Time: 20 minutes
Chill Time: 8 hours (overnight)
Bake Time: 45 minutes
Total Time: 9 hours
Servings: 8–10
Ingredients
- 6 large croissants, sliced in half lengthwise
- 8 large eggs
- 2 cups whole milk (or half-and-half for a richer version)
- 1 cup shredded cheddar cheese
- 1 cup shredded mozzarella cheese
- ½ cup grated Parmesan cheese
- ½ tsp garlic powder
- ½ tsp onion powder
- Salt and black pepper, to taste
- 1 cup cooked bacon, sausage, or ham (optional)
- 2 tbsp chopped green onions (optional garnish)
Instructions
- Prepare the Dish: Lightly butter a 9×13-inch baking dish. Slice the croissants in half and arrange them evenly in the dish.
- Make the Custard: In a large bowl, whisk together eggs, milk, garlic powder, onion powder, salt, and pepper until well combined.
- Assemble the Casserole: Sprinkle half of the cheese and cooked meat (if using) over the croissants. Pour the egg mixture evenly over everything. Top with remaining cheese.
- Chill Overnight: Cover the dish with plastic wrap and refrigerate overnight to let the croissants soak up all that custard goodness.
- Bake: Preheat oven to 350°F (175°C). Remove the casserole from the fridge, uncover, and let it sit at room temperature for 20 minutes. Bake uncovered for 40–45 minutes, or until golden and puffed.
- Serve: Garnish with green onions or fresh herbs. Serve warm and enjoy with fresh fruit or a side of coffee!
Tips & FAQs
Can I make this the same day? Yes — let the casserole rest for at least 30 minutes before baking to absorb the custard.
What’s the best cheese to use? A mix of cheddar, mozzarella, and Parmesan gives a perfect balance of flavor and meltiness.
Can I make it vegetarian? Absolutely — just skip the meat and add sautéed spinach, mushrooms, or roasted peppers instead.
How do I store leftovers? Refrigerate in an airtight container for up to 3 days. Reheat in the oven or microwave before serving.
Nutrition Summary
| Serving Size | Calories | Protein | Carbs | Fat | Sugar | Fiber |
|---|---|---|---|---|---|---|
| 1 serving | 420 | 20g | 25g | 27g | 5g | 1g |
Disclaimer: Nutrition values are approximate and may vary based on ingredients used.
