In a large mixing bowl, combine the ground chicken, panko breadcrumbs, Parmesan cheese, beaten egg, minced garlic, oregano, onion powder, salt, and black pepper.
Mix the ingredients by hand until just incorporated; avoid over-mixing to prevent the meatballs from becoming tough.
Lightly oil your hands and portion the mixture into 16 to 18 meatballs, approximately 1.5 inches in diameter.
Preheat the air fryer to 400°F (200°C) for 3 minutes.
Lightly grease the air fryer basket with olive oil or non-aerosol cooking spray.
Place the meatballs in the basket in a single layer, ensuring they are not touching to allow for proper airflow.
Cook for 10 to 12 minutes, shaking the basket halfway through the cooking time to ensure even browning.
Verify the internal temperature has reached 165°F (74°C) using an instant-read thermometer.
Remove from the air fryer and garnish with fresh parsley before serving.