1. Combine chicken cutlets, onion, garlic, pepper, tomato sauce, mustard, maple syrup, soy sauce, and barbecue sauce in a slow cooker. Season with salt and pepper.
2. Cook on high for four hours. While the chicken mixture is still in the slow cooker, using a potato masher, mash the chicken. It will turn into shredded chicken pieces.
3. Serve on rolls or in pita bread, with coleslaw and sour pickles.