Mix all ingredients, except for the chicken breasts, in the slow cooker. Next, add the chicken breasts and press down to immerse in the sauce. Cook on high for 3-4 hours, and then remove the chicken from the slow cooker.
Using two forks, pull chicken apart, and then transfer to a serving dish; spoon some of the remaining juice over the pulled chicken to moisten.
Fill taco shells or top tortillas with chicken and toppings of your choice.
Recipe by Eat In Eat Out at https://eatineatout.ca/pulled-chicken-tortillas/