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 insert, positioning it fat-side up to allow rendered juices to baste the meat during cooking.
03 - In a mixing bowl, whisk together 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 place it on a large cutting board. Using two forks, shred the meat along the grain, discarding any large pieces of connective tissue or excess fat.
06 - Return the shredded beef to the slow cooker and stir gently to coat all the meat evenly with the sauce. Serve piled high on burger buns topped with coleslaw, or over rice as desired.