01 -
Combine light brown sugar, garlic powder, onion powder, smoked paprika, salt, black pepper, and ground dry mustard in a small bowl and mix thoroughly.
02 -
Place chicken legs into a large bowl, sprinkle the spice rub evenly over them, and toss to coat all pieces. Cover and refrigerate for at least 2 hours or proceed immediately if short on time.
03 -
In a separate bowl, whisk together barbecue sauce and water until combined. Set aside.
04 -
Clean the grill grates and oil them. Preheat grill to medium heat, approximately 350°F (175°C).
05 -
Place chicken legs on the grill and close the lid. Cook, turning every few minutes until internal temperature reaches 130–140°F (54–60°C), approximately 15 to 20 minutes.
06 -
Baste chicken legs liberally on both sides with the barbecue sauce mixture. Continue grilling, turning frequently and basting every minute, until internal temperature reaches at least 165°F (74°C), about 10 more minutes. For extra tenderness and crispy skin, cook to 180–190°F (82–88°C).
07 -
Remove chicken legs from the grill and let rest briefly before serving to retain juices.