Prepare the marinade: In a large bowl, whisk together gochujang, soy sauce, honey, mirin, garlic, ginger, oil, and black pepper.
Prepare the chicken: Butterfly the chicken legs.
How to butterfly chicken drumstick:
Cutting the meat to the bone to open the leg up will give you more surface area for the marinade to penetrate. Here is a step by step instructions on how to butterfly a chicken.
Add chicken legs to the bowl and toss until the chicken is evenly coated with the marinade. Cover and refrigerate for at least 30 minutes or overnight.
Preheat the oven to 400°F (200°C).
Bake the chicken: Place chicken legs on a baking sheet lined with parchment paper SKIN SIDE DOWN. Bake for 30-35 minutes or until the chicken is cooked through and the skin is crispy.
Broil for 2 minutes to get crispier skin.
Air fry the chicken: Preheat the air fryer to 350°F. Line your air fryer basket or air fryer tray with a parchment paper liner.
Arrange your chicken drumsticks skin side down. Air fry for 20 minutes. Flipping halfway. Broil at the last 2 minutes to get a crispier skin.
Garnish with sliced scallions, cilantro, and sesame seeds.
Serve hot, and enjoy!