Overnight Croissant Breakfast Casserole is the kind of dish that brings families together around the breakfast table, whether it’s for a festive holiday brunch or a cozy weekend treat. Imagine waking up to a warm, cheesy casserole that practically makes itself while you enjoy your beauty sleep. The fluffy croissants soak up a delicious custard made of eggs, milk, and your choice of savory additions like bacon or sausage. This dish isn’t just practical; it’s a comforting embrace on a plate, making mornings feel special without any fuss.
Why You’ll Love This Dish
When it comes to breakfast, we all want something that’s easy to prepare but still brings plenty of smiles. This Overnight Croissant Breakfast Casserole checks all the boxes. It’s quick to put together, and you can customize it based on what you have on hand. Plus, it’s a family-approved recipe that even the pickiest eaters will enjoy.
"A friend shared this recipe with me, and I’ve been making it every weekend! It’s so easy, and my kids gobble it up like there’s no tomorrow!" – A Happy Cook
How This Recipe Comes Together
Preparing this casserole is as simple as it gets. You gather your ingredients and throw together a few layers of croissants, cheese, and savory toppings before chilling it overnight. The next morning? Just pop it in the oven and let the magic happen while you sip your coffee. Your home will be filled with mouthwatering aromas that will have everyone rushing to the kitchen.
{image_template}
What You’ll Need
To whip up this delicious Overnight Croissant Breakfast Casserole, gather these ingredients:
- 6 croissants, torn into pieces
- 6 large eggs
- 2 cups milk
- 1 cup shredded cheese (cheddar or Gruyere)
- 1/2 cup cooked and crumbled bacon or sausage
- 1/4 cup chopped green onions
- Salt and pepper to taste
- 1 teaspoon vanilla extract (optional)
- 1 tablespoon Dijon mustard (optional)
Feel free to use whatever cheese you have on hand, and if you’re looking for a lighter version, substitute the bacon or sausage with sautéed vegetables for a meatless twist.

Step-by-Step Instructions
- In a large bowl, whisk together the eggs, milk, salt, pepper, and if desired, the optional vanilla and mustard.
- In a greased baking dish, layer the torn croissants, followed by the cheese, meat, and green onions.
- Pour the egg mixture evenly over all the layered ingredients.
- Cover and refrigerate overnight to let those flavors meld beautifully.
- The next morning, preheat your oven to 350°F (175°C).
- Bake uncovered for 45-50 minutes or until the casserole is golden and set.
- Let it cool slightly before serving, and watch it disappear!
Best Ways to Enjoy It
This casserole is wonderful served on its own, but you can elevate the experience with a few simple touches. Consider drizzling some hot sauce for a spicy kick or serving it alongside a fresh fruit salad for a refreshing contrast. It pairs beautifully with crisp bacon or a warm biscuit.
Keeping Leftovers Fresh
If you have leftovers (which is always welcome), simply cover them tightly in the fridge. This casserole can be enjoyed for up to 3 days. You can reheat individual portions in the microwave, or pop it back in the oven to warm through. For longer storage, it freezes beautifully! Just make sure it’s cooled completely before transferring it to an airtight container.
Helpful Cooking Tips
- For an extra indulgent twist, add a layer of cream cheese between the croissant and egg mixture for a rich and creamy texture.
- Ensure the croissants are not overly stale; slightly stale works best as they soak up the egg mixture without becoming mushy.
- You can mix in leftover roasted vegetables or any cheese you have to customize this dish to your liking.
Recipe Variations
- Swap croissants for brioche or even sliced bread for a different texture.
- Try different cheeses like feta or pepper jack for an extra flavor boost.
- Add a handful of spinach or kale for added nutrition and a pop of color.
FAQs
What is the prep time for this casserole?
Preparation takes about 15-20 minutes, but you will need to refrigerate it overnight before baking.
Can I make it gluten-free?
Yes, simply substitute the croissants with a gluten-free bread option and ensure that any meats or sauces used are also gluten-free.
How do I store leftovers?
Cover tightly and refrigerate for up to 3 days. You can also freeze individual portions for up to a month. Just thaw completely before reheating.
This Overnight Croissant Breakfast Casserole is a heartwarming dish that caters to all occasions, ensuring a delightful start to any day! Happy cooking!