In a small bowl, whisk together gochujang, honey, soy sauce, rice vinegar, sesame oil, garlic, and ginger. Set aside.
Heat a large skillet over medium-high heat and add the vegetable oil.
Pat the chicken thighs dry with a paper towel and season lightly with salt and pepper. Place them in the hot pan and sear for 3-4 minutes per side.
Reduce the heat to medium-low. Pour the prepared sauce over the chicken, ensuring it coats each piece.
Cover the pan and let the chicken cook for 10-15 minutes, turning occasionally to ensure even cooking and glazing.
Remove the lid and increase the heat slightly to allow the sauce to thicken and caramelize, about 3-5 minutes.
Sprinkle the chicken with sesame seeds and chopped green onions before serving.