Lightly spray the slow cooker with cooking spray. Add all of the ingredients into the pot and mix gently as best as you can. Cover and cook on HIGH for 4-5 hours, or on LOW for 7-8 hours, until sweet potatoes are soft, and chicken is cooked through. In the last hour of cooking, take two forks and shred the chicken breasts right in the pot. Serve plain, or with toppings and enjoy!