Crock-Pot Pizza - cooking recipe

Ingredients

1 1/2 lb. browned hamburger
1 medium onion
1 box rigatoni noodles, cooked
2 cans (1 qt.) pizza sauce
2 (8 oz.) pkg. Mozzarella cheese
1 pkg. pepperoni
1 can mushrooms

Preparation

Layer in crock-pot as listed 3 times.
Cook on low 4 to 5 hours.