01 - Place the chicken thighs or breasts in the bottom of the slow cooker.
02 - Whisk together the soy sauce, honey, rice vinegar, brown sugar, sesame oil, garlic, and ginger in a medium bowl until well combined.
03 - Pour the teriyaki sauce mixture evenly over the chicken in the slow cooker.
04 - Cover and cook on high for 4 hours or on low for 6-7 hours, until the chicken is tender and reaches an internal temperature of 165°F.
05 - Remove the chicken from the slow cooker and shred or slice as desired.
06 - Mix the cornstarch and water in a small bowl to create a slurry. Stir the slurry into the sauce in the slow cooker.
07 - Return the chicken to the slow cooker, stir to coat with the thickened sauce, and cook for an additional 15-20 minutes on high until the sauce reaches desired consistency.
08 - Serve the teriyaki chicken over steamed rice and garnish with green onions and sesame seeds.