1 1/2 pounds lean ground beef
2 medium onions -- chopped
2/3 16 ounces pkg rigatoni, cooked
2 cans pizza sauce
2 pounds shredded mozzarella cheese
1 package pepperoni
mushrooms

In a skillet, brown and crumble meat along with onions. Layer ingredients in slow cooker in the order given. Cook low for 5 hours. Makes a full pot.