Put butter in a crockpot on high to melt. When butter is melted, add remaining ingredients except the meatballs. Bake the meatballs separately, according to package instructions, turning once to brown. When meatballs are baked, add to crockpot, turn crockpot to low temperature and let them go! Ideally, let the meatballs simmer in the sauce for 1-2 hours.