Quick-freeze boneless chicken fillet in an air fryer for 20-30 minutes. Different quantities of frozen chicken fillet, different temperatures and cooking time will be different, generally 20-30 minutes. When the air fryer is used to make frozen chicken fillet, the frozen chicken fillet is directly put into the air fryer for heating. Before using air fryer to make frozen chicken fillet, it needs to be preheated for five minutes in advance. Fried chicken fillet can be eaten directly or dipped in ketchup and other condiments.