Waking up to a ham egg and cheese croissant casserole is a surefire to start your day off right. Assemble it the night ahead of time so that all you have to do in the morning is bake it. Your whole family is going to love this wonderful brunch entree.

Piece of ham and croissant egg casserole on plate with pan of remaining casserole nearby.

This post is sponsored by the Utah Pork Producers Association. As always, all opinions are honest and my own.

Breakfast casserole recipes are perfect for holiday brunches or just to celebrate a weekend morning. This tasty casserole is no different, all you have to do is pop it in the oven and you can enjoy being with your family while it bakes.

The flavors will transport you to a French cafe. The notes of Dijon mustard, gruyere cheese, eggs, and ham will remind you of a croque madame.

You could use bread if you would like, but croissants give it even more richness and a nice fluffy texture. We loved them in the monte cristo breakfast casserole, so it seemed like a natural choice to use them again here.

Ingredients including croissants, gruyere cheese, ham, eggs, half and half, Dijon mustard, salt, pepper and garlic powder ready to be made into a breakfast bake.

Square baking dish with layers of croissant bits, ham, and cheese soaking in eggy custard mixture before it bakes.

In fact, this casserole has a lot of similarities to that one. However, this is the savory version and the monte cristo leans more on the sweet notes.

I love how thick and fluffy this casserole is when you bake it in an 8-inch square baking dish. However, you can reduce the bake time almost in half if you bake it in a 9×13-inch pan.

You could also double the recipe and bake it in a 9×13-inch pan if you are feeding a crowd. Just add a few minutes to the bake time to make sure the center cooks all the way through.

Storage

Cover the leftovers, or put them in an airtight container, and keep them in the refrigerator for up to five days. They reheat well in the microwave.

Spatula lifting piece of ham egg and cheese breakfast casserole out of the pan showing the puffy texture with bits of ham and cheese throughout.

Piece of breakfast casserole on plate showing golden brown top and fluffy egg center with bits of ham and gooey cheese, ready to eat.

Can Breakfast Casseroles be Frozen?

Yes! If you need to assemble the casserole more than a couple of days in advance, use the freezer to help you.

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To freeze an already baked casserole, cool it completely. Cover tightly and freeze. To reheat, thaw completely, and bake covered in the oven at 350ºF until warm.

To freeze an unbaked casserole, cover the dish rightly with plastic wrap then cover the dish with foil and freeze. To bake after freezing, thaw completely and bake according to the recipe directions.

Breakfast casserole with golden brown bits of croissant on top and fluffy egg, cheese, and ham filling.

Bite of ham, egg and cheese croissant bake on fork, ready to eat.

Ham + Eggs = Heaven

We just love the classic combination of ham and eggs. Ham is such an affordable and versatile protein choice.

You can use leftover ham to make recipes like this, or pick up sliced ham at the grocery store. Either way, it will help to make a nice hearty meal quickly and easily.

Adding in a bit of mustard and cheese really helps to round out the flavors. We fell in love with that combo when we first made a ham and asparagus frittata and we have leaned heavily and the combination ever since.

We just know you are going to love the combination as well. This casserole is a perfect place to start, then try the others.

More Recipes To Try

Croque Madame Waffles

Ham Potato and Cheese Quiche

Ham Egg and Cheese Sliders

Sausage Croissant French Toast Casserole

Spatula lifting piece of ham and croissant breakfast casserole out of the pan showing airy texture with pockets of gooey cheese.

5 from 4 ratings

Ham Egg and Cheese Croissant Breakfast Casserole

Author: Carlee

Servings: Servings

This ham and cheese croissant egg bake is perfect for make ahead brunches. The eggy custard helps to hold together the flaky croissants, savory ham, and gooey cheese. It is a great way to feed your family without stress.

Prep: 15

Cook: 1

Chill Time 1

Total: 2 15

Ingredients

Instructions

Grease an 8-inch square baking dish.
Tear half of the 10 ounces croissants and scatter the pieces over the bottom of the pan.
Sprinkle half of the 1½ cups cooked ham and 2 cups shredded gruyere cheese over the croissants.
Tear the remaining croissants and distribute over the bottom layers.
Distribute the remaining ham and cheese over the top.
In a medium bowl, beat the 7 large eggs until uniform.
Stir in the 2 cups half and half, 1½ Tablespoons Dijon mustard, ½ teaspoon salt, ¼ teaspoon ground black pepper and ¼ teaspoon garlic powder.
Pour the egg mixture over the croissant layers. Gently press down to help everything soak.
Cover the dish with plastic wrap and refrigerate for at least 30 minutes, but overnight is preferred.
When ready to bake, pull the casserole out of the fridge to start taking the chill off as you preheat the oven to 375℉.
Remove the plastic wrap and cover the dish with aluminum foil. (If you lightly spray the foil with cooking spray, it will help to keep the cheese from sticking to the foil.)
Bake for 40 minutes covered then remove the foil and bake for about 20 minutes more uncovered. The edges should be golden and the center shouldn't have any wobble left. You can check with a thermometer to make sure the center of the casserole is at least 160℉ if you would like.
Let stand for 5-10 minutes before cutting and serving.

Notes

Feel free to experiment with different kinds of cheese. Swiss cheese would be a great option, so would provolone or cheddar.

You can make the casserole in a 9×13-inch pan if you want to reduce the cook time. Cover and bake for about 20 minutes then uncover and bake for another 15-20 minutes.

You can use whole milk in place of the half and half or a mix of milk and heavy cream.