01 - Arrange the chicken thighs or breasts in an even layer at the bottom of the crockpot.
02 - In a medium bowl, whisk together the soy sauce, honey, rice vinegar, brown sugar, sesame oil, garlic, and ginger until the sugar dissolves and the mixture is well combined.
03 - Pour the teriyaki sauce mixture evenly over the chicken in the crockpot.
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 cooked chicken from the crockpot and shred or slice into bite-sized pieces.
06 - In a small bowl, stir the cornstarch and water together to create a smooth slurry. Whisk the slurry into the hot sauce remaining in the crockpot.
07 - Return the shredded chicken to the crockpot, stir to coat evenly with the thickened sauce, and cook on high for an additional 15-20 minutes until the sauce reaches desired consistency.
08 - Serve the teriyaki chicken over steamed rice and garnish with sliced green onions and toasted sesame seeds if desired.