01 - Combine smoked paprika, garlic powder, onion powder, kosher salt, black pepper, and chili powder in a small bowl. Mix thoroughly until evenly blended.
02 - Pat the chuck roast dry and rub the seasoning mixture evenly over all surfaces, pressing gently to adhere the spices to the meat.
03 - Transfer the seasoned roast to the slow cooker, positioning it fat-side up to allow basting during cooking.
04 - Whisk together the barbecue sauce, beef broth, apple cider vinegar, brown sugar, and Worcestershire sauce in a mixing bowl until the sugar dissolves and the mixture is smooth.
05 - Pour the sauce mixture over the seasoned beef in the slow cooker, ensuring even coverage. Cover with the lid and cook on the low setting for 8 hours, or until the beef is fork-tender and pulls apart effortlessly.
06 - Carefully remove the beef from the slow cooker and shred using two forks, discarding any large pieces of fat. Return the shredded meat to the slow cooker and stir thoroughly to coat every strand with the sauce.
07 - Pile the saucy pulled beef generously onto burger buns and top with coleslaw, or serve over rice according to preference.