In a small bowl, whisk together the avocado oil, sesame oil, garlic, ginger, dark soy sauce, and honey.
Place the chicken pieces into a bowl and pour over three-quarters of the marinade, reserving the remaining marinade for brushing later.
Cover and refrigerate for at least 1 hour or up to 24 hours for maximum flavor.
If using wooden skewers, soak them in water for 30 minutes before cooking.
Preheat a barbecue or hot griddle until very hot.
Thread the marinated chicken, bell pepper, and onion alternately onto each skewer.
Discard any marinade that has been in contact with the raw chicken.
Grill the Honey Garlic Chicken Skewers for 8–10 minutes, turning every 2–3 minutes. Brush with the reserved unused marinade halfway through cooking.
Cook until the chicken reaches an internal temperature of 165°F (74°C) and is no longer pink inside.
Sprinkle with sesame seeds and chopped coriander before serving.