Rigatoni

28 oz. jar spaghetti sauce
12 oz. rigatoni, cooked
1-1 1/2 lbs. ground beef, browned
3 c. shredded mozzarella cheese
1/2 lb. pepperoni slices (I used turkey pepperoni-delicious & way less fat, like 70% less!)
sliced mushrooms, optional
sliced onions, optional

1. In slow cooker, layer half of each ingredient in order listed. Repeat.
2. Cover. cook on low 4-5 hours.