1.
Add the sliced chicken breasts to a slow cooker.
2.
In a bowl, whisk together the ketchup, apple cider vinegar, brown sugar, and Worcestershire sauce. Pour the mixture over the chicken.
3.
Cover and cook on low for 4 hours or high for 2 hours.
4.
Once the chicken is done, remove and shred with a fork. Return chicken to the slow cooker for 5-10 minutes.
5.
Just before the chicken is finished, prepare the apple slaw. Stir together the vinegar, Greek yogurt, and the honey in a small bowl. Season with salt to taste. Combine the coleslaw mix and the apple in a bowl and pour the dressing over and mix well. Serve on top of the pulled chicken sandwiches.