01 - In a small bowl, combine smoked paprika, garlic powder, onion powder, kosher salt, black pepper, and chili powder. Mix thoroughly, then rub the seasoning blend evenly over all surfaces of the trimmed chuck roast.
02 - Set the seasoned chuck roast in the bottom of the slow cooker, arranging it flat so it cooks evenly.
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.
05 - Carefully remove the beef from the slow cooker and place it on a cutting board. Shred the meat using two forks, discarding any large pieces of fat. Return the shredded beef to the slow cooker and stir to coat every strand in the sauce.
06 - Pile the saucy pulled beef generously onto burger buns and top with creamy coleslaw, or serve over rice for a hearty plate.