01 -
Mix cranberry jelly, chili sauce, brown sugar, garlic powder, and black pepper together in a big skillet. Keep stirring over medium heat until everything melts into a smooth, hot sauce, about 5 minutes.
02 -
Drop the frozen meatballs into the sauce and stir until they're all coated. Turn heat down to medium-low, put a lid on, and let everything bubble gently for 15 to 20 minutes until the meatballs are hot all the way through.