Spray bottom of slow cooker with cooking spray. Dice chicken tenderloins into bite size pieces and place them in the bottom of the slow cooker.
Peel and dice sweet potato into 1/2 inch cubes. Add to slow cooker and mix in with the chicken and corn.
Pour bottle of BBQ sauce over the mixture in the slow cooker. Add about 1/4 cup of water and stir through.
Prepare Jiffy cornbread mix as directed on box and pour over the top of the BBQ chicken mixture. (I would have made 2 boxes if I had had another on hand.)
Set to low and cook for 6 hours.
Serve BBQ Chicken Cornbread Casserole. This is a great one dish dinner!