In a large bowl, combine the remaining 1 cup cheese, cooked sausage and bacon, sweet peppers, onions, mushrooms, biscuit mix, milk, salt, pepper, and eggs. Pour over potatoes in baking dish; spread evenly. Sprinkle reserved 1 cup cheese. Cover and refrigerate at least 8 hours but no longer than 24 hours. It can also be frozen; just increase the cooking time.