Make the Marinade:
In a bowl, whisk together gochujang, soy sauce, sesame oil, honey, vinegar, garlic, and ginger until smooth.
Marinate the Chicken:
Place chicken in a bowl or zip-top bag. Add marinade and toss to coat well. Refrigerate for at least 30 minutes or overnight for deeper flavor.
Cook the Chicken:
Heat oil in a skillet over medium-high heat. Add chicken and cook 5–7 minutes per side (or until cooked through and caramelized). You can also grill or broil it if preferred.
Serve:
Slice if needed and serve over rice or in lettuce cups. Top with sesame seeds and green onions.