Preheat the Air Fryer: Preheat the air fryer to 350°F (175°C) for about 3-5 minutes.
Prepare the Mixture: In a mixing bowl, combine ground chicken, bread crumbs, egg, onion, garlic, Worcestershire sauce, salt, and pepper. If using, add finely chopped vegetables. Mix well until fully combined.
Form the Meatloaf: Shape the mixture into a loaf that will fit comfortably in your air fryer basket.
Air Fry: Place the formed meatloaf in the air fryer basket, making sure it is not touching the sides. Cook for 20-25 minutes, or until the internal temperature reaches 165°F (74°C).
Add Topping: In the last 5 minutes of cooking, spread ketchup on top of the meatloaf for a flavorful glaze.
Rest and Slice: Let the meatloaf rest for a few minutes before slicing and serving.