Season the chicken breasts with garlic powder, onion powder, smoked paprika, salt, and pepper.
Place the chicken breasts in a slow cooker or Instant Pot.
Add the barbecue sauce over the chicken.
If using a slow cooker, cook on low for 4 hours or high for 2 hours. For Instant Pot, cook on high pressure for 10 minutes.
Once cooked, shred the chicken using two forks.
Mix the shredded chicken with the sauce in the cooker.
Toast the sandwich buns until golden brown.
Assemble the sandwiches by placing pulled chicken on the bottom bun.
Add coleslaw on top of the chicken for crunch.
Finish with pickles and the top bun. Serve immediately.