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 - Set the seasoned chuck roast in the bottom of the slow cooker, arranging it fat-side up to allow the rendering fat to baste the meat during cooking.
03 - In a mixing bowl, whisk together the barbecue sauce, beef broth, apple cider vinegar, brown sugar, and Worcestershire sauce until the sugar dissolves and the mixture is smooth. Pour the sauce evenly over the seasoned beef.
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. Avoid lifting the lid during cooking to maintain consistent heat.
05 - Carefully remove the beef from the slow cooker and transfer it to a large cutting board. Using two forks, shred the meat along the grain, discarding any large pieces of fat or connective tissue.
06 - Return the shredded beef to the slow cooker and stir gently to coat every strand in the sauce. Serve piled high on burger buns topped with coleslaw, or plate over rice as desired.