01 - Place chicken thighs or breasts in the bottom of the slow cooker, ensuring pieces are in an even layer.
02 - Whisk together soy sauce, honey, ketchup, rice vinegar, sesame oil, garlic, ginger, and red pepper flakes in a medium bowl until fully combined.
03 - Pour sauce over chicken, covering all pieces. Cook on LOW for 4 hours or HIGH for 2 hours until tender and fully cooked.
04 - Remove chicken from slow cooker and shred or cut into bite-sized pieces. Set aside on a plate.
05 - Mix cornstarch and water in small bowl to form slurry. Stir into sauce in slow cooker and cook on HIGH for 20-30 minutes until thickened.
06 - Return shredded chicken to thickened sauce, stirring to coat. Serve hot garnished with sesame seeds and green onions over steamed rice.