Place all the meatball mixture ingredients in a bowl (everything except the cooking oil), and mix well to ensure it is thoroughly combined.
Scoop up a tablespoon-sized amount of the meatball mixture and roll it into a ball (approximately 1-1½ inches/ 3cm is a good size). Continue until you have used all the meatball mixture.
Preheat air fryer to 390°F/ 195°C.
Spritz the air fryer basket with oil if it is prone to sticking, and place the meatballs in the air fryer basket in a single layer. Arrange them so that they are not touching.
Air fry meatballs for 10-15 minutes until golden brown, and the internal temperature in the center of the largest meatball has reached at least 160°F/72°C [Note 2].
Notes
Cook times vary. Test the internal temperature with an instant meat thermometer to ensure it has reached at least 160°F/72°C in the center of the largest meatball.