In a large mixing bowl, combine together chicken, dill, mint, oregano, lemon zest, onion, salt, garlic, egg and feta.
Mix well. Using your hands or a spoon, shape the mixture into meatballs, approximately 2 inches in diameter.
Preheat air fryer to 400F
Preheat the air fryer to 375 F and lightly spray the basket with non-stick cooking spray. Place the meatballs in a single layer in the air fryer basket, making sure they don't touch each other.
Air fry for 15 minutes, being sure to flip halfway. (You can also do 400F and cook for 10 minutes but I prefer a little lower temp to not dry the chicken out)