Place the chicken breasts in the crockpot.
Mix BBQ sauce, chicken broth, apple cider vinegar, brown sugar, garlic powder, onion powder, salt, and pepper in a bowl.
Pour the sauce mixture over the chicken.
Optionally add sliced onions and bell peppers.
Cover the crockpot and cook on low for 6-8 hours or high for 3-4 hours.
Once cooked, shred the chicken with two forks inside the sauce.
Stir the shredded chicken to coat it in the BBQ sauce.
Taste and adjust seasoning if necessary.
Serve hot with your favorite sides.