Trim any excess fat from the chicken thighs.
In a large baggie or bowl add the teriyaki sauce and chicken thighs. Coat evenly.
Let the chicken thighs marinate for 30 minutes at room temperature.
Preheat Blackstone over medium high heat. Once hot, add the boneless skinless teriyaki chicken thighs.
Cook for 6-8 minutes on each side until the chicken thighs reach an internal temperature of 165F.
Remove chicken thighs from the flat top grilll. Wait 5 minutes before eating.
