WHISK all the ingredients for the Kansas-Style BBQ sauce in a small bowl and set aside.
PLACE potatoes, brussels sprouts, and carrots into a 9-inch cast iron skillet. Place chicken thighs on top of the vegetables and using a pastry brush, generously brush Kansas-Style BBQ sauce on the tops of the chicken thighs.
COVER cast iron skillet tightly with a sheet of foil.
PLACE cast iron skillet onto grill and roast for 40 to 45 minutes or until chicken is tender and juices run clear or meat thermometer reads 165 °F (74 °C). During the last 15 minutes of cooking, remove foil and roast uncovered for 15 minutes. Once chicken is done, remove from grill and let cool for 20 minutes.
SERVE and enjoy!
Notes
If you prefer to bake this, you may bake this in the oven at 400°F for 40 to 45 minutes or until chicken is tender and juices run clear or meat thermometer reads 170°F for breasts, 180°F for other pieces.