Easy Overnight Croissant Breakfast Casserole

Introduction

Wake up to a brunch-worthy delight without the morning hassle: this Easy Overnight Croissant Breakfast Casserole is indulgently rich, full of flaky buttery croissants, and loaded with savory flavors that satisfy. Perfect for busy mornings, holiday gatherings, or when you want to effortlessly impress guests, this recipe lets you assemble the night before and simply bake in the morning.

What Makes This Croissant Casserole a Must-Try

Unlike traditional breakfast bakes, this casserole uses croissants for a tender, custardy texture punctuated with a golden, crisp top. The luscious custard soaks overnight, permeating every buttery layer. Customizable with your favorite cheeses and add-ins, it strikes the perfect balance between savory and just a touch of decadence. Serve it for brunch, holidays, or whenever you want a make-ahead breakfast that feels luxurious and tastes unforgettable.

Simple Prep with the Right Tools

Chopping veggies and prepping ingredients is quick and tidy with the Mueller Pro-Series 10-in-1, 8 Blade Vegetable Chopper. This handy gadget is perfect for dicing bell peppers, onions, or mushrooms evenly, ensuring each bite is flavorful and well-balanced.

Lining your casserole dish with a piece of Reynolds Kitchens Brown Parchment Paper Roll makes serving and clean-up even easier, letting you focus on your event rather than the aftermath.

Assembling the Overnight Casserole

To build your casserole:
– Tear buttery croissants into chunks and scatter them in your prepared baking dish.
– Layer in cooked breakfast sausage, sautéed vegetables, and shredded cheese.
– Pour a savory egg custard over the top, letting it soak in overnight. Using the Farberware Professional Heat Resistant Nylon Meat and Potato Masher ensures your sausage is perfectly crumbled and evenly distributed throughout the casserole.
– The next morning, simply bake until puffed, golden, and irresistibly aromatic.

If you want to chop and store ingredients ahead, the Rubbermaid Brilliance Food Storage Containers, Set of 5 keep everything fresh and make morning prep a breeze.

Serving and Storing Suggestions

Let your casserole rest a few minutes before serving so the custard sets up beautifully. Slice and serve straight from the dish or store leftovers in airtight containers—this breakfast is just as delicious reheated. Enjoy with fresh fruit, a dollop of sour cream, and a hot cup of coffee for a complete meal!

Nutritional Information and Serving Size

This breakfast casserole serves 8–10 generous portions. With the addition of sausage and cheese, each serving delivers a protein-packed and satisfying start to your day, ranging from approximately 350–450 calories, depending on your add-ins.

Easy Overnight Croissant Breakfast Casserole (Recap)

This croissant breakfast casserole is your golden ticket to a stress-free, crowd-pleasing brunch. Its buttery layers, savory fillings, and make-ahead magic make it an ultimate standby for cozy weekends and festive mornings.

Instructions

1. Lightly grease a 9×13-inch casserole dish or line with a sheet from the Reynolds Kitchens Brown Parchment Paper Roll for quick cleanup.
2. In a skillet, cook the sausage until browned, using the Farberware Professional Heat Resistant Nylon Meat and Potato Masher for even crumbles. Remove sausage and drain any excess fat.
3. Add bell pepper and onion to the same skillet; sauté until softened, about 4–5 minutes. A SENSARTE Nonstick Frying Pan Skillet, 9.5 Inch is ideal for even cooking and easy cleanup.
4. Layer half the torn croissants in the prepared baking dish. Top with half the cooked sausage, sautéed veggies, and cheese. Repeat layers.
5. In a large bowl, whisk together eggs, milk, salt, black pepper, and Dijon mustard.
6. Pour the mixture evenly over the croissants and fillings. Gently press down with the back of a spoon so all croissant pieces soak in the custard.
7. Cover tightly and refrigerate overnight (or at least 6 hours).
8. In the morning, preheat oven to 350°F. Bake uncovered for 40–50 minutes, or until set and golden on top. Tent with foil if browning too quickly.
9. Allow to cool for 10 minutes before serving. Garnish with chopped parsley if desired.

Cook and Prep Times

Prep Time: 20 minutes
Cook Time: 50 minutes
Total Time: 1 hour 10 minutes (plus overnight soak)