Arrange the chicken in a mixing bowl. Pour the teriyaki sauce in the bowl and add garlic powder, salt, and ground black pepper. Mix well. Cover the mixing bowl. Marinate the chicken overnight. Make sure to place the chicken inside the refrigerator.
Grill the chicken. You can use any type of grill. I am using a grill plate (on a stovetop). Grill one side of the chicken for 5 minutes and then flip it over and grill the other side for 5 minutes.
Remove the skin from the chicken. Continue to grill both sides for 7 to 10 minutes per side or until the chicken is fully cooked. Make sure to baste the chicken with the leftover marinade every 3 minutes to keep it moist.
Transfer to a serving plate. Sprinkle sesame seeds on top. Share and enjoy!