A cozy, make-ahead Croissant Omelet Breakfast Casserole with flaky croissants, creamy eggs, melted cheese, and savory add-ins baked in a 9×13 pan for an easy brunch.
Cooked turkey bacon or breakfast sausage, crumbled, 1 cup
Baby spinach, lightly packed, 1 cup
Garlic powder, 1/2 teaspoon
Italian seasoning, 1/2 teaspoon
Salt, 1 teaspoon
Black pepper, 1/2 teaspoon
Butter or nonstick spray for greasing the baking dish
Instructions
Preheat your oven to 350°F and lightly grease a 9×13-inch baking dish with butter or nonstick spray.
Tear the croissants into large bite-size pieces and spread them evenly in the prepared baking dish.
Scatter the cooked turkey bacon or sausage, baby spinach, and shredded cheddar cheese evenly over the croissant pieces.
In a medium bowl, whisk together the eggs, whole milk, heavy cream, garlic powder, Italian seasoning, salt, and black pepper until smooth and well combined.
Slowly pour the egg mixture evenly over the croissants, gently pressing down any pieces that sit above the custard so they can soak it up.
Let the casserole rest for about 10 minutes to allow the croissants to absorb some of the custard, or cover and refrigerate overnight for a make-ahead option.
Bake the casserole uncovered for 35 to 45 minutes, or until the top is golden, the edges are bubbling, and the center is just set with a slight jiggle.
Remove from the oven and let the casserole cool for 10 minutes, then slice into squares and serve warm.
Notes
For the best texture and flavor, use day-old croissants so they can absorb the custard without turning mushy.
If your croissants are very fresh and soft, lightly toast them in the oven for a few minutes before assembling the casserole.
You can assemble the casserole the night before, cover it tightly, and refrigerate it, then bake it in the morning for an easy make-ahead breakfast.
The casserole is done when the center is set and a knife or toothpick inserted near the middle comes out mostly clean with a few moist crumbs.
Feel free to swap or add veggies such as sautéed mushrooms, bell peppers, or caramelized onions to customize the casserole to your taste.