01 - Soak wooden skewers in water for at least 30 minutes to prevent burning during grilling. Skip this step if using metal skewers.
02 - In a mixing bowl, whisk together the soy sauce, brown sugar, rice vinegar, sesame oil, minced garlic, minced ginger, gochujang, and honey until well combined. Reserve 1/4 cup of the sauce for basting later.
03 - Place the chicken pieces in a large bowl and pour the remaining marinade over them. Toss to coat evenly, cover, and refrigerate for at least 30 minutes or up to 2 hours for deeper flavor penetration.
04 - Thread the marinated chicken, red bell pepper, yellow bell pepper, and red onion alternately onto the skewers. Brush the assembled skewers lightly with vegetable oil to prevent sticking.
05 - Preheat an outdoor grill or grill pan to medium-high heat, approximately 400°F.
06 - Place the skewers on the hot grill and cook for 10 to 12 minutes, turning occasionally. During the last few minutes of cooking, brush generously with the reserved BBQ sauce. Cook until the chicken reaches an internal temperature of 165°F and develops a lightly charred exterior.
07 - Transfer the grilled skewers to a serving platter. Sprinkle with toasted sesame seeds and finely sliced green onion. Serve immediately while hot.