Preheat your oven to 400°F (200°C).
In a mixing bowl, combine the gochujang, honey, soy sauce, minced garlic, sesame oil (or butter), rice vinegar, and optional ginger. Whisk until well combined to create a smooth sauce.
Pat the chicken thighs dry with paper towels and sprinkle with salt on both sides.
In a large oven-safe skillet, heat a drizzle of oil over medium-high heat. Once hot, add the chicken thighs skin-side down. Sear for about 5-7 minutes until the skin is golden brown and crispy.
Flip the chicken thighs over and pour the honey gochujang sauce over them, ensuring they’re well coated.
Transfer the skillet to the preheated oven and bake for about 15 minutes, then flip back again so the skin is on top and continue baking for another 10-15 minutes or until the chicken reaches an internal temperature of 75°C (165°F) and the sauce is bubbly.
Once done, remove the skillet from the oven and let the chicken rest for a few minutes; this helps keep it juicy. If the sauce is too liquid, remove the chicken temporarily and reduce it on the stove until you achieve the desired consistency. Then serve the chicken thighs topped with sliced green onions and a sprinkle of sesame seeds for an extra touch.