Prep Crock Pot: Place chicken breasts in the crock pot and pour 1 cup bbq sauce over top.
Cook: Cover and cook on HIGH 3-4 hours or LOW 6-8 hours.
Shred: Once chicken is done cooking, shred with two forks. The sauce will be thinned out due to the heat, but as it cools and you mix the shredded chicken around, it will thicken back up. Add the additional 1/2 cup bbq sauce (or more if you want); stir to combine.
Storage: leftover BBQ chicken can be kept in an airtight container in the fridge for 3-4 days or in the freezer for up to 3 months. Thaw in the fridge overnight and then reheat.