01 - Preheat oven to 400°F. Line a baking sheet with foil and lightly oil the surface.
02 - Pat chicken thighs dry with paper towels. Season evenly on both sides with kosher salt and ground black pepper.
03 - In a small bowl, vigorously whisk together gochujang, soy sauce, honey, rice vinegar, sesame oil, minced garlic, and grated ginger until the mixture is smooth.
04 - Place chicken thighs skin-side up on the prepared baking sheet. Brush a generous layer of gochujang glaze over each thigh, reserving some glaze for later use.
05 - Roast chicken thighs for 25 minutes. Remove from oven, brush with remaining glaze, and return to oven for 5–7 minutes or until chicken reaches an internal temperature of 165°F and glaze has caramelized.
06 - Let chicken rest for 5 minutes. Finish with a sprinkle of sesame seeds and sliced green onions before serving.