Cozy Sausage Croissant Breakfast Casserole (Easy Overnight Bake)

Introduction

This Cozy Sausage Croissant Breakfast Casserole is your ticket to an effortless, crowd-pleasing morning meal. Bursting with savory sausage, buttery croissants, and melty cheese, it’s assemble-ahead simple—just chill overnight and bake in the morning for a warm, hearty breakfast that feels like comfort in every bite.

Ideal for holidays, weekend brunches, or feeding a hungry crew, this overnight bake transforms humble ingredients into an elegant, delicious centerpiece. There’s no stress about morning prep—everything comes together the night before so you can simply pop it in the oven and savor the compliments.

Why This Sausage Croissant Breakfast Casserole Stands Out

What sets this casserole apart is the decadently flaky croissants, which soak up a rich, seasoned egg custard and bake up tender on the inside, crisp on the edges. Juicy sausage and a trio of cheeses add savory depth and irresistible melted pockets throughout. The result is a breakfast that eats like a warm, comforting embrace—a true showstopper with minimal effort.

Prep Made Easy: Key Tools for Effortless Assembly

For a seamless prep, crumble and brown your sausage in a quality nonstick pan; the SENSARTE Nonstick Frying Pan Skillet, 9.5 Inch is perfect for quick, even cooking with easy cleanup. To chop your onions and veggies in seconds, use a Mueller Pro-Series 10-in-1, 8 Blade Vegetable Chopper for precise, uniform pieces that distribute perfectly in your casserole.

Line your baking dish with a sheet of Reynolds Kitchens Brown Parchment Paper Roll for easy removal and mess-free serving. When it comes to storing leftovers or prepping ahead, reach for a set of Rubbermaid Brilliance Food Storage Containers to keep your breakfast casserole fresh and ready to go.

Easy Overnight Assembly Steps

Layer pillowy torn croissants in your baking dish, top with sausage and cheese, then pour over the seasoned egg mixture. Cover, refrigerate, and let the magic happen overnight as the flavors meld together.

Come morning, simply uncover and bake until the top is golden and the center is just set. Your kitchen will fill with a mouthwatering aroma, beckoning everyone to the breakfast table.

Customize Your Casserole

This recipe is perfectly adaptable—swap in sharp cheddar for extra bite, add sautéed spinach or mushrooms for a veggie boost, or use turkey sausage for a lighter profile. Whisk in fresh herbs like chives or thyme for added fragrance and flair.

Serving Suggestions and Make-Ahead Tips

Serve thick, satisfying slices of this casserole alongside fresh fruit or a crisp salad. Reheat extra slices easily in a toaster oven or an COSORI Air Fryer 9-in-1, Compact & Large 6-Qt for a quick, crispy finish.

This make-ahead bake fits perfectly into a brunch spread and holds up beautifully for leftovers, making weekday breakfasts a breeze.

Nutritional Information and Servings

Yield: 8 generous servings. Each serving is approximately 425–500 calories, depending on cheese selection and sausage type. Rich in protein and perfect for fueling a busy morning, it’s a treat best balanced with fruit or veggies on the side.

Cozy Sausage Croissant Breakfast Casserole (Recap)

Warm, satisfying, and super simple to prep, this casserole offers everything you crave in a breakfast—flaky croissants, creamy custard, and savory sausage. It’s a surefire hit, whether for a special brunch or a comforting weekend treat.

Instructions

1. Grease a 9×13-inch baking dish with butter or nonstick spray. For effortless release and cleanup, line the bottom with a sheet of Reynolds Kitchens Brown Parchment Paper Roll.
2. In a SENSARTE Nonstick Frying Pan Skillet, 9.5 Inch, cook the crumbled sausage over medium heat, breaking apart the meat with a Farberware Professional Heat Resistant Nylon Meat and Potato Masher. When nearly browned, add onions and cook until soft. Drain any excess fat.
3. Scatter the torn croissants in the prepared baking dish and layer the cooked sausage mixture evenly over them. Sprinkle with shredded cheese.
4. In a large bowl, whisk together eggs, milk, cream, Dijon mustard, garlic powder, a big pinch of salt, and pepper. (Use an Amazon Basics Digital Kitchen Scale if you’re measuring ingredients by weight.)
5. Pour the egg mixture evenly over the casserole, pressing lightly to ensure all the croissant pieces soak up the custard. Top with fresh herbs if desired.
6. Cover tightly and refrigerate for at least 6 hours, preferably overnight.
7. In the morning, preheat your oven to 350°F. Uncover the casserole and bake for 40–50 minutes, until the custard is just set and the top is golden. (A ThermoPro TP19H Digital Meat Thermometer can help you check doneness—look for an internal temperature of 160°F.)
8. Let cool for 10 minutes, then slice and serve hot.

Cook and Prep Times

Prep Time: 20 minutes
Cook Time: 45 minutes
Total Time: 1 hour 5 minutes plus chilling overnight

Enjoy the ultimate in cozy, no-fuss breakfast comfort with this decadent, easy Sausage Croissant Breakfast Casserole!