Zippy Egg Casserole

Step 1
Place sausage in a large, deep skillet. Cook over medium-high heat until evenly brown. Drain, crumble, and set aside.

Step 2
In a lightly greased 9×13-inch baking dish, arrange croutons in a single layer. Layer with Cheddar cheese, Swiss cheese, and pepper Jack cheese. Top with the cooked sausage.

Step 3
In a large bowl, beat together eggs, half-and-half, milk, mustard, onion, salt, and pepper. Pour into the dish over sausage. Cover and refrigerate, 8 hours or overnight.

Step 4
The next morning, preheat the oven to 350 degrees F (175 degrees C).

Step 5
Bake in the preheated oven for 45 to 60 minutes. Let sit for 20 minutes before serving.