01 - Combine smoked paprika, brown sugar, kosher salt, black pepper, garlic powder, onion powder, and cayenne pepper in a small bowl.
02 - Evenly coat the beef chuck roast with the spice mixture.
03 - Place the seasoned beef in the slow cooker and pour beef broth, barbecue sauce, Worcestershire sauce, and apple cider vinegar over it.
04 - Cover and cook on low heat for 8 hours until the beef is tender and shreds easily.
05 - Remove beef from the slow cooker, shred using two forks, and discard excess fat.
06 - Return shredded beef to the slow cooker and mix thoroughly with the cooking liquid.
07 - Toast sandwich buns if desired.
08 - Pile shredded beef onto buns, add coleslaw and drizzle with extra barbecue sauce if preferred.
09 - Serve sandwiches immediately.