Place the chicken breasts in a slow cooker and pour the BBQ sauce over them. Cook on low for 6-7 hours or high for 3-4 hours until the chicken is tender.

Once cooked, remove the chicken from the slow cooker and shred it using two forks. Return the shredded chicken to the slow cooker and mix it with the remaining BBQ sauce.

Preheat a skillet over medium heat. Toast the hamburger buns until golden brown.

Place a generous amount of the BBQ chicken on the bottom half of each toasted bun. Top with coleslaw and pickles if desired, then place the top half of the bun on each sandwich.