
Whisk together soy sauce, honey, hoisin sauce, rice vinegar, sesame oil, ginger, garlic, and chili flakes.
Place the chicken in the slow cooker and pour the sauce on top. Cook on low for 4 hours.
Remove the chicken from the slow cooker and shred.
In a small bowl, whisk together the water and cornstarch. Stir to dissolve.
Place the liquid from the slow cooker in a saucepan. Add the cornstarch mixture and bring to a low boil. Stir to thicken. Boil for 1 minute.
Pour the sauce over the shredded chicken. You can add it all back to the slow cooker to keep warm or to a serving dish.
Serve plain or over rice.