01 - Place chicken thighs or breasts in the base of the slow cooker.
02 - In a medium bowl, whisk together soy sauce, hoisin sauce, honey, water, brown sugar, rice vinegar, garlic, ginger, sesame oil, black pepper, and red pepper flakes until smooth.
03 - Pour sauce mixture over chicken, ensuring each piece is well coated. Cover and cook on LOW for 4 hours or on HIGH for 2 hours, until chicken is tender and cooked through.
04 - Remove chicken from slow cooker and shred with two forks.
05 - In a small bowl, mix cornstarch and cold water to form a slurry. Stir into sauce in slow cooker.
06 - Return shredded chicken to slow cooker, stirring to combine. Cook on HIGH for 15-20 minutes, or until sauce has thickened. Serve over steamed rice, garnished with green onions and sesame seeds.