This would have to go into that "so easy it's not really a recipe" category.
1 cut up chicken or just your favorite pieces
2 cups barbecue sauce or a jar of your favorite store-bought
Put the chicken in the slow cooker (Crockpot™ is actually a brand name) and cover with the barbecue sauce. Cook on low for 6-8 hours. (Newer slow cookers will probably only take 4 hours as they cook much hotter than old ones.)