I just made a super easy bbq chicken in my crock pot today.
Wash & dry a whole chicken. Pat dry. Sprinkle with salt & pepper (inside & out). Pour whole (or most of) one bottle of bbq sauce over chicken. Cook on low for 7-8 hours. I had less time than that, so I turned it on high for the first hour and then it cooked it on low for another 4.5 hours. It was super juicy and tender.