Overnight Croissant Breakfast Casserole

Introduction

An Overnight Croissant Breakfast Casserole is the ultimate solution for easy, elegant holiday brunch recipes. This savory bake transforms flaky, buttery croissants into a decadent, custardy centerpiece perfect for entertaining. The rich blend of flavors ensures that every guest at your brunch will rave about the meal—and you’ll love the hands-off prep that lets you relax with your guests instead of scrambling in the kitchen.

Why Make an Overnight Croissant Breakfast Casserole?

This casserole delivers a luscious, slightly sweet custard soaked into crisp, golden croissants, studded with ham, cheese, and roasted veggies. Leaving it to chill overnight intensifies the flavors and guarantees a no-fuss morning: just pop it in the oven and enjoy a show-stopping brunch without breaking a sweat. Croissants provide incomparable richness, making this casserole a standout among holiday brunch recipes.

Customize Your Add-Ins for Holiday Flair

While ham and Swiss cheese make a classic combo, feel free to adapt the filling with sautéed spinach, mushrooms, or even smoked salmon and dill for a festive twist. Fresh vegetables can be diced quickly and easily with a Mueller Pro-Series 10-in-1, 8 Blade Vegetable Chopper, helping you prep everything in a fraction of the time.

Tips for the Perfect Overnight Casserole

For best results, use slightly stale croissants, as they’ll absorb the creamy custard without turning mushy. Line your baking dish with a strip of Reynolds Kitchens Brown Parchment Paper Roll for easy cleanup and to ensure perfect slices every time. When it’s time to bake, a reliable KitchenAid Ribbed Soft Silicone Oven Mitt Set helps you safely lift the hot dish straight from the oven to your brunch table.

Serving Suggestions

This casserole shines on a festive table with a fresh fruit salad and sparkling orange juice. For picnics or potlucks, pack leftovers easily in a Rubbermaid Brilliance Food Storage Container. Garnish each slice with herbs like chives or parsley for a burst of color and a touch of elegance.

Nutritional Information and Serving Size

A single batch yields about 8 hearty servings, with each portion offering roughly 350–400 calories, depending on the cheese, meat, and dairy used. It provides a filling, balanced start to any celebratory day.

Holiday-Ready Overnight Croissant Breakfast Casserole (Recap)

This overnight casserole pairs the buttery indulgence of croissants with the comforting flavors of a savory custard bake. With flexible ingredients and stress-free prep, it’s a must-have addition to your holiday brunch recipes repertoire. It impresses both adults and kids—no wonder it’s the talk of the brunch table!

Instructions

1. Grease a 9-by-13-inch baking dish and line with a piece of Reynolds Kitchens Brown Parchment Paper Roll for easy lifting and serving.
2. Arrange torn croissants evenly in the baking dish. Sprinkle the diced ham and shredded cheese evenly over the croissants. Add chopped spinach and cherry tomatoes on top.
3. In a large mixing bowl, whisk together eggs, milk, cream, Dijon mustard, salt, and black pepper. A Ninja BL610 Professional 72 Oz Countertop Blender can make the custard extra smooth and well-emulsified.
4. Pour the egg mixture evenly over the casserole, pressing down gently to help the croissants absorb the custard. Cover tightly with plastic wrap and refrigerate overnight.
5. On the day of serving, preheat oven to 350°F (175°C). Remove casserole from the fridge while oven preheats.
6. Bake uncovered for 45–55 minutes, or until puffed and golden. For easy handling, use a KitchenAid Ribbed Soft Silicone Oven Mitt Set to remove the hot dish from the oven.
7. Let rest for 10 minutes before slicing. Garnish with fresh herbs and serve warm. Store leftovers in a Rubbermaid Brilliance Food Storage Container for easy reheating.

Cook and Prep Times

Prep Time: 20 minutes (plus overnight chill)
Cook Time: 50 minutes
Total Time: 1 hour 10 minutes (excluding chilling time)