Whisk together soy sauce, honey, brown sugar, rice vinegar, sesame oil, ginger, and garlic in a medium bowl.
Reserve 0.25 cup of the marinade for the final glaze; pour the remaining marinade over the chicken pieces and marinate for 15 minutes.
Preheat the air fryer to 400°F (200°C).
Arrange the chicken pieces in a single layer in the air fryer basket, ensuring no overlap to allow for proper airflow.
Air fry at 400°F (200°C) for 12 to 15 minutes, shaking the basket at the 7-minute mark to ensure even browning.
While the chicken cooks, combine the reserved marinade with a slurry of cornstarch and water in a small saucepan.
Simmer the sauce over medium heat for 2-3 minutes until it achieves a thick, syrupy consistency.
Transfer the cooked chicken to a clean bowl, toss with the thickened glaze, and garnish with sesame seeds and sliced green onions.