Slice the meat around the bone without cutting if off completely. Press down on the meat and the chicken should easily spread open resembling wings.
Season all sides with your choice of BBQ seasoning.
Preheat the grill to 400 degrees and set it for dual zone.
Place the drumsticks on the indirect side first for about 15 minutes to get most of the cook done, and them move to the direct side to crisp up the skin and get some nice color on the meat.
Once the butterflied chicken drumsticks reach 175 degrees internal temp, remove the drumsticks off the grill.
Dunk them in your favorite BBQ and place the chicken back on the grill for another 1-2 minutes for the sauce to caramelize and enjoy.