Adjust top oven rack to six inches below the broiler. Preheat broiler to high. Add oil to rimmed baking sheet. Add the meatballs, and roll them around until they are coated in the oil. Arrange in two rows in such a way that they will cook evenly under the broiler element. Transfer pan to the broiler, and cook until meatballs are browned on the top, 4 to 5 minutes. Carefully remove the pan, and use a pair of tongs to flip the meatballs. Return pan to the oven, and cook until browned on the other side, another 4 to 5 minutes. Remove and set pan aside.