Place the chicken breasts in the bottom of your slow cooker.
In a small bowl, whisk together the BBQ sauce, chicken broth, apple cider vinegar, garlic powder, onion powder, salt, and black pepper.
Pour the sauce evenly over the chicken.
Cover and cook on LOW for 5-6 hours or HIGH for 2–3 hours, until the chicken reaches an internal temperature of 165°F.
Shred the chicken with two forks directly in the slow cooker.
Stir the shredded chicken into the sauce and let it sit for 5–10 minutes before serving.