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. *If your slow cooker "runs hot" and tends to overcook or burn BBQ sauce, add 1/2 cup of water.
In a small mixing bowl, prepare Jiffy cornbread mixes as directed on box and pour over the top of the BBQ chicken mixture.
Set to low and cook for 6 hours.
Serve BBQ Chicken Cornbread Casserole. This is a great one dish dinner!