In a bowl, mix together barbecue sauce, brown sugar, Dijon mustard, apple cider vinegar, Worcestershire sauce, garlic powder, onion powder, and black pepper.
Place sliced ham in the slow cooker and pour the barbecue sauce mixture over it.
Stir to coat the ham evenly with the sauce.
Cook on low for 4-6 hours, or until the ham is heated through and the flavors are well combined.
Toast the hamburger buns and spoon the barbecue ham onto the buns.
Serve hot and enjoy your delicious barbecue ham sandwiches!
Notes
Customize the sandwich by adding your favorite toppings such as coleslaw, pickles, or cheese. Adjust the barbecue sauce and sugar quantities to suit your taste preferences.