Breakfast casserole

This can be mostly assembled the night before and you can use any assortment of meat/veggies you have on hand.  Unless I'm making this for a Christmas brunch I leave out the red peppers because I don't care for them.  At Christmas time the red peppers and green onions look festive. 

12 ounces (3 cups) cheddar cheese, shredded
12 ounces (3 cups) mozarella cheese, shredded
8 ounces mushrooms, chopped and sauteed
1/3 cup sliced green onions
1/2 medium red pepper, chopped
8 ounces of cooked ham, diced
1/2 cup white whole wheat flour
1 3/4 cup milk
8 eggs, beaten

In large bowl, lightly toss cheeses together.  Sprinkle half the cheese mixture in ungreased 13x9 baking dish.  Sprinkle mushrooms, green onions, red pepper and ham evenly over cheese layer.  Add remaining cheese. **  Heat oven to 350.  In large bowl whisk flour, milk and eggs; pour over layers in baking dish.  Bake 35-40 minutes or until mixture is set and top is lightly browned.  Let stand about 10 minutes.  Serves 12

** To make ahead, prepare to this point, cover and refrigerate.

If I'm just making this for our family I will generally use a smaller 2.2 qt dish instead of the 13x9.  Here are the ingredient measurements if you use the smaller dish:

2 cups cheddar
2 cups mozarella
mushrooms, green onions, red pepper & ham to cover
1/3 cup flour
1 1/3 cups milk
6 eggs