In a large bowl combine the marinade ingredients, soy sauce, Dijon mustard, garlic salt, chili powder and smoked paprika. Give it a good whisk. Add honey, lemon juice, olive oil, garlic powder, and ground pepper. Mix until all ingredients are incorporated.
Remove chicken thighs from package, cut off excess skin. Place in 9x13 baking dish.
Pour half the marinade over the chicken thighs. Cover with plastic wrap, refrigerate minimum 2 hours or overnight. Reserve remaining marinade for mopping the chicken during the grilling process.
Preheat BBQ and bring up to temperature, 350 degrees. Spray with non-stick cooking spray.
Sear two minutes on both sides over direct heat. Transfer meat to indirect heat. Cook for 10-15 minutes, cover closed.
While grilling brush each chicken thighs with a generous layer of the reserved marinade. Grill until the internal temperature reaches 165 degrees F.