01 - Whisk together soy sauce, brown sugar, sesame oil, garlic, ginger, gochujang, rice vinegar, sesame seeds, and black pepper in a mixing bowl until well combined and sugar has dissolved.
02 - Add chicken thighs to the marinade, turning to coat thoroughly. Cover and refrigerate for minimum 30 minutes, up to 2 hours for deeper flavor penetration.
03 - Shred carrots and purple cabbage, thinly slice cucumber, slice avocado, and chop green onions. Cook rice if not already prepared. Whisk mayonnaise, gochujang, rice vinegar, and honey until smooth for the spicy mayo.
04 - Heat grill pan or skillet over medium-high heat. Grill marinated chicken thighs for 5-6 minutes per side until cooked through with internal temperature of 165°F and nicely charred. Let rest for 5 minutes before slicing.
05 - Divide warm rice among four bowls. Arrange sliced BBQ chicken, shredded carrots, cucumber, purple cabbage, and avocado sections on top. Drizzle generously with gochujang mayo, garnish with green onions and sesame seeds. Serve immediately while warm.