Layer in sprayed 9x13 pan:
1 box seasoned croutons
2 c. frozen hash brown potatoes

Mix and sprinkle over croutons:
1 c. cheddar cheese
1 c. mozzarella cheese
1 c. pepper cheese

Mix:
8 large eggs, well beaten
3 1/2 c. milk
1 T. minced onion
1 T. mustard
pepper to taste

Pour egg mixture over the cheeses.

Sprinkle over top:
1 pound of fryed crumbled bacon, or sausage, or ham.

Cover and refrigerate over night. Bake uncovered at 350' for about 45 minutes or until done. Cut into squares and serve with biscuits.