01 - Place chicken thighs or breasts in the bottom of the slow cooker, ensuring even distribution for consistent cooking.
02 - Whisk together soy sauce, honey, ketchup, rice vinegar, sesame oil, garlic, ginger, and red pepper flakes in a medium bowl until fully incorporated.
03 - Pour sauce over chicken, covering all pieces. Cook on LOW for 4 hours or HIGH for 2 hours until tender and thoroughly cooked.
04 - Remove cooked chicken from slow cooker and shred or cut into bite-sized pieces. Set aside temporarily.
05 - Mix cornstarch and water in a small bowl to form slurry. Stir into sauce in slow cooker and return shredded chicken.
06 - Cook on HIGH for 20-30 minutes until sauce thickens and coats chicken evenly.
07 - Serve hot, garnished with sesame seeds and sliced green onions. Pair with steamed rice or stir-fried vegetables.