This crockpot ravioli meatball casserole only has 5 ingredients! Ravioli, meatballs, and melted cheese cook together to create an easy slow cooker casserole that will have everyone coming back for seconds. This flavorful & hearty family-friendly meal can be served any night of the week. Instructions to make this comforting ravioli meatball recipe in the Instant Pot are also included.