Line the bottom of the slow cooker with the onions sliced onions. Place the chicken breasts over the onions.
In a bowl, mix all of the sauce ingredients together and pour it over the chicken. Cook for 8 hours on low. When the chicken is tender, shred the chicken using two forks.
Serve on buns.
Adjust the spiciness by adjust the amount of Tabasco sauce you put in.The calories shown are based on the recipe serving 20, with 1 serving being 1/20 of the chicken. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information.**