Meatballs may contain ground meat mixed with seasonings, breadcrumbs, mashed potatoes, rice, and liquid. The meat mixture is often shaped, browned. and simmered in a sauce for 30 to 45 minutes over low heat or in a 350° F. oven. During cooking the meat is basted with the sauce occasionally. Meatballs also may be fried in a pan or in deep fat.