Ham and Cheese Croissant Casserole is a rich and buttery casserole that is perfect for holiday brunches. This breakfast casserole is a great way to use up leftover ham and stale croissants. It's savory with lots of cheddar cheese and just a hint of sweetness from a little honey which really brings out the buttery flavor of the croissants.
Grease a 11x7-inch baking dish.
Place croissant pieces in baking dish.
Sprinkle ham, Parmesan cheese, and half the cheddar cheese on top and gently move the croissant pieces around so that some of the ham and cheese works it's way down and around the croissants.
In a large bowl, whisk the eggs, half-and-half, dry mustard, honey, salt and pepper. Pour over casserole.
Sprinkle with remaining cheddar cheese. Cover with aluminum foil and refrigerate for 8 to 24 hours.
Bake covered in a 350 degree oven for 25 minutes. Uncover and bake another 20 minutes.