Mix all the marinade ingredients together, then pour over the boneless chicken thighs. Place the chicken thighs in refrigerator and marinate for a minimum of 3 hours, overnight is better.
Preheat grill to 275-300 degrees. Place the chicken thighs on grill, and cook for an hour- 1 ½ hours, flip and cook for another ½ hour. Times will vary widely, based on the actual temperature of grill and size of the chicken thighs. Use your best judgement.
Nutrition data based on 4 pounds of chicken, estimate of ½ the marinade remaining on chicken and Greek yogurt info from whole milk yogurt.Note on cooking time: these were cooked on a Big Green Egg at low temperature, which basically smokes them. If cooking on a gas grill or charcoal bricket grill simply cook them as low as you feel comfortable, but the time will be much less than 2 hours.