Brown meat and onion. Drain grease. Add sauces. Simmer. Boil noodles until tender; drain. In crock pot, put a layer of noodles, meat mixture, cheeses and pepperoni. Repeat layer one more time. Cook on high for 30 minutes, then on low for 1 hour or until cheese melts. This may also be baked in a 350 oven until cheese melts.