01 - Whisk together soy sauce, brown sugar, sesame oil, garlic, ginger, gochujang, rice vinegar, sesame seeds, and black pepper in a bowl until well combined.
02 - Add chicken thighs to the marinade, turning to coat thoroughly. Cover and refrigerate for 30 minutes to 2 hours for optimal flavor penetration.
03 - Prepare vegetables and cook rice while chicken marinates. Mix mayonnaise, gochujang, rice vinegar, and honey in small bowl until smooth for the sauce.
04 - Heat grill pan or skillet over medium-high heat. Cook chicken thighs 5-6 minutes per side until internal temperature reaches 165°F and nice char develops. Rest 5 minutes before slicing.
05 - Divide rice among four bowls. Arrange sliced BBQ chicken, carrots, cucumber, purple cabbage, and avocado on top. Drizzle with gochujang mayo and garnish with green onions and sesame seeds.