Combine BBQ sauce, brown sugar, apple cider vinegar, olive oil, garlic powder, onion powder, smoked paprika, and crushed red pepper in the basin of a slow cooker
Place chicken breast in sauce and use a spoon to cover with sauce.
Cover and cook on low for 6-7 hours or high 3-4 hours. Chicken is done when it is easily shredded with a pair of forks.
Shred chicken and stir well to coat with BBQ sauce. Serve.