In the bottom of a slow cooker, combine barbecue sauce, apple cider vinegar, brown sugar, sea salt, and garlic powder. Stir well to combine.
Nestle the chicken breasts into the sauce, turning to be sure they are fully coated. Cook on high for 2-3 hours or low for 4-6 hours, until the chicken is very tender and easy to pull apart with two forks.
Shred chicken. You can do this either inside the crockpot, or by removing the chicken to a cutting board. (I usually find it easier to remove it.) Return shredded chicken to the crockpot and stir well. Serve right away, or leave on the slow cooker’s keep warm setting for up to 2-3 hours.
Serve in sandwiches, wraps, bowls, salads, as you like.
Notes
Amounts: This recipe is flexible. I'd use the same amount of sauce for up to roughly 2 pounds of chicken, and increase the amount of sauce beyond that.
Salt: If using regular table salt, reduce the amount to 1/2 teaspoon.