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 thoroughly over the beef chuck roast.
03 - Place the seasoned beef roast into the slow cooker insert.
04 - Pour beef broth, barbecue sauce, Worcestershire sauce, and apple cider vinegar over the meat evenly.
05 - Cover and cook on low heat for 8 hours until the meat is tender and shreds easily with a fork.
06 - Remove beef from the slow cooker and shred finely using two forks, discarding excess fat.
07 - Return the shredded beef to the slow cooker and mix well with the remaining cooking liquid.
08 - Toast sandwich buns if desired for added texture.
09 - Pile shredded beef onto buns, top with coleslaw and extra barbecue sauce if preferred.
10 - Present sandwiches immediately while warm.