Wrap each piece of chicken with two slices of bacon. Place the bacon-wrapped chicken in the bottom of a slow cooker with a capacity of at least 6 quarts.
Grate the apples to the core and place in a large bowl. Add the BBQ sauce, garlic powder, and vinegar; stir to combine. Pour the BBQ mixture over the chicken.
Cook chicken on low for 6-8 hours (or on high for 3-4 hours). Transfer the chicken to a baking dish and broil on low for 5-7 minutes. Spoon the pan juices over the chicken a time or two. The chicken is done when the bacon begins to crisp and the sauce begins to caramelize. Serve with the pan sauce. Enjoy!