01 - Combine smoked paprika, brown sugar, kosher salt, black pepper, garlic powder, onion powder, and cayenne pepper in a small bowl.
02 - Thoroughly rub the spice mixture all over the trimmed beef chuck roast.
03 - Place the seasoned beef into the slow cooker container.
04 - Pour beef broth, barbecue sauce, Worcestershire sauce, and apple cider vinegar over the beef.
05 - Cover and cook on low heat for 8 hours until the beef becomes tender and shreds easily with a fork.
06 - Remove the cooked beef, shred it using two forks while discarding any excess fat.
07 - Return shredded beef to the slow cooker and stir thoroughly to blend with the cooking liquids.
08 - Toast sandwich buns if desired to enhance texture and flavor.
09 - Pile shredded beef onto buns, topping with coleslaw and extra barbecue sauce as preferred.
10 - Serve sandwiches immediately while warm for optimal taste.