01 - Combine smoked paprika, brown sugar, kosher salt, black pepper, garlic powder, onion powder, and cayenne pepper in a small bowl.
02 - Rub the spice mixture evenly all over the beef chuck roast.
03 - Transfer the seasoned beef into the slow cooker.
04 - Pour beef broth, barbecue sauce, Worcestershire sauce, and apple cider vinegar over the meat.
05 - Cover and cook on low for 8 hours until beef is tender and shreds easily.
06 - Remove beef from cooker and shred with two forks, discarding excess fat.
07 - Return shredded beef to slow cooker and mix thoroughly with the cooking liquids.
08 - Toast sandwich buns if preferred.
09 - Pile pulled beef on buns, top with coleslaw and extra barbecue sauce as desired.
10 - Serve sandwiches immediately while warm.