In a large bowl, combine gochujang, honey, soy sauce, rice vinegar, sesame oil, minced garlic, and grated ginger. Mix well to create a marinade.
Add the chicken thighs to the marinade, ensuring they are well coated. Cover and refrigerate for at least 30 minutes, or up to 2 hours for more flavor.
Preheat your air fryer to 380°F or your oven to 400°F.
If using an air fryer, place the marinated chicken thighs in the basket in a single layer. Cook for 18-20 minutes, flipping halfway through. If baking, place the chicken on a lined baking sheet and bake for 25-30 minutes, or until the chicken is cooked through and has a nice glaze.
Once cooked, remove the chicken from the air fryer or oven and let it rest for 5 minutes.
Garnish with sesame seeds and sliced green onions before serving.