Place kimchi, gochujang paste, soy sauce, rice vinegar, honey, and sesame oil in a blender. Blend until smooth. Set aside. See note.
Add vegetable oil to a saucepan or large skillet over medium heat. When hot, add chicken and sauté until no longer pink.
Add Korean sauce; mix to combine. Reduce heat to medium-low, cover and simmer for 15 minutes, or until the chicken is cooked through and the sauce reduces down.
Transfer chicken to a serving plate, sprinkle with sesame seeds and sliced green onions, and drizzle with honey, if desired.
