Place chicken pieces in the slow cooker.
Mix together chili powder, paprika, chipotle powder, salt and pepper and rub all over chicken.
Pour ½ cup barbecue sauce over chicken and toss to coat. Cover and cook until chicken is tender 4-6 hours on LOW. (5 hours worked great for me.) The slow cooker can also go to the WARM setting if you are not ready to eat the chicken after cooking 4-6 hours.
Transfer chicken to a large bowl and allow to cool slightly. With two forks, shred meat into bite size pieces, but not too fine.
Pour the liquid that remains in the slow cooker into a fat separator (or leave the liquid in the slow cooker and try to skim the fat off the top with a large spoon.)
Heat the remaining 1 cup of barbecue sauce in a small saucepan until hot. Toss shredded chicken with hot barbecue sauce and 1 cup of braising liquid. You’ll have extra liquid if you need it. Serve warm either by itself or on toasted whole grain buns or in a quesadilla.