Arrange the Meatballs
Carefully place the stuffed meatballs on top of the sliced onions in the baking dish. Arrange them evenly, leaving enough space between each meatball for proper heat circulation.
Bake the Meatballs
Transfer the baking dish to the preheated oven. Bake the meatballs for about 25-30 minutes, or until they are cooked through and have reached an internal temperature of 160°F (71°C). This temperature ensures that the meat is safe to eat while remaining juicy and flavorful.