01 - In a small bowl, combine smoked paprika, garlic powder, onion powder, kosher salt, black pepper, and chili powder. Mix until evenly blended, then rub the seasoning mixture thoroughly over all surfaces of the chuck roast.
02 - Transfer the seasoned chuck roast into the slow cooker, positioning it flat along the bottom for even cooking.
03 - In a mixing bowl, whisk together the barbecue sauce, beef broth, apple cider vinegar, brown sugar, and Worcestershire sauce until smooth and well combined. Pour the sauce evenly over the beef in the slow cooker.
04 - Cover the slow cooker and cook on the low setting for 8 hours, or until the beef is fork-tender and pulls apart with minimal effort.
05 - Carefully remove the beef from the slow cooker and place it on a cutting board. Using two forks, shred the meat along the grain. Return the shredded beef to the slow cooker and stir thoroughly to coat all the meat in the sauce.
06 - Pile the saucy pulled beef generously onto burger buns and top with coleslaw, or serve over rice according to preference.