Mix the sauce: In a bowl, whisk together the BBQ sauce, apple cider vinegar, brown sugar, onion powder, and garlic powder.
Add the chicken: Place the chicken breasts in the slow cooker and pour the BBQ sauce mixture over them. Make sure they’re fully coated.
Cook: Set the slow cooker to high for 2-3 hours or low for 4-6 hours.
Shred the chicken: Once cooked, use two forks to shred the chicken right in the crockpot. Stir everything together so it soaks up all that flavorful sauce.
Serve and enjoy!