Prepare the Marinade: In a bowl, mix the teriyaki sauce, soy sauce, honey, minced garlic, grated ginger, and sesame oil (if using). Stir well to combine.
Marinate the Chicken: Place the chicken thighs in a resealable plastic bag or shallow dish and pour the marinade over them. Seal the bag or cover the dish, then refrigerate for at least 30 minutes (or up to 2 hours) to allow the flavors to infuse.
Preheat the Air Fryer: Preheat your air fryer to 380°F (190°C) for about 5 minutes.
Cook the Chicken: Remove the chicken from the marinade and place the thighs in the air fryer basket in a single layer. Cook for 20-25 minutes, flipping halfway through. The chicken should be golden brown on the outside and reach an internal temperature of 165°F (74°C).
Rest the Chicken: Once cooked, let the chicken rest for about 5 minutes to retain its juices.
Serve and Garnish: Slice the chicken and garnish with sesame seeds and chopped green onions. Serve with steamed rice or your favorite side dish.