Slice chicken thighs in to thin strips, 3-4 strips from each thigh
Make the marinade by mixing gochujang, soy sauce, brown sugar, minced garlic, ginger paste, mirin, sesame oil, and black pepper. Marinate the chicken for 4-8 hours, or overnight
Air fry the marinated chicken at 400°F for 10 minutes or until fully cooked, work in 2-3 batches if needed. Top with sesame seeds, and enjoy!