01 - Place the 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 well combined.
03 - Pour the sauce mixture over the 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 the chicken from the slow cooker and shred with two forks.
05 - In a small bowl, mix cornstarch and cold water to form a slurry. Stir this into the sauce in the slow cooker.
06 - Return the shredded chicken to the slow cooker, stirring to combine. Cook on HIGH for an additional 15-20 minutes, or until the sauce has thickened.
07 - Serve over steamed rice, and garnish with sliced green onions and toasted sesame seeds.