01 - Whisk together soy sauce, brown sugar, sesame oil, rice vinegar, gochujang, garlic, ginger, and black pepper in a bowl. Add chicken thighs and toss to coat thoroughly. Marinate for at least 15 minutes, or refrigerate overnight for enhanced flavor penetration.
02 - Heat vegetable oil in a large grill pan or skillet over medium-high heat. Remove chicken from marinade, allowing excess to drip off. Cook chicken for 4-5 minutes per side until nicely charred and internal temperature reaches 165°F. Let rest for 5 minutes before slicing into strips.
03 - Divide cooked rice evenly among four bowls. Arrange sliced chicken, shredded carrots, cucumber slices, purple cabbage, and green onions on top of each portion. Sprinkle sesame seeds over the bowls for added texture.
04 - Top bowls with optional garnishes including kimchi, extra gochujang or sriracha, fresh lime wedges, and cilantro leaves. Serve immediately while chicken is still warm.