Make the marinade. Add all ingredients except your chicken to a jar. Using an immersion blender, blend until smooth and combined, about 30 seconds. You can also use a blender. Adjust according to taste as some brands of peppers are spicier than others.
Marinate your chicken. Add chicken to a large baking dish or plastic bag and pour over the marinade. Mix well to combine. If desired you can turn/mix chicken every few hours to ensure coating. Marinate for at least 30 minutes and up to 24 hours. The longer the better.
Grill. Heat the grill to medium-high heat (around 400-450 degrees). Once hot, place chicken close to direct heat and grill for 6-8 minutes. Flip and move to indirect heat (not directly over fire/coals) and cook for another 5-10 minutes depending on how thick your thighs are, or until internal temperature reaches 165 degrees. Let chicken rest for 5 minutes.
Enjoy! Serve with your favorite side dishes and enjoy!
