01 - In a small bowl, combine the smoked paprika, garlic powder, onion powder, kosher salt, black pepper, and chili powder. Mix thoroughly until evenly blended.
02 - Pat the trimmed chuck roast dry with paper towels. Rub the spice mixture evenly over all surfaces of the meat, pressing gently to adhere.
03 - Transfer the seasoned roast to the slow cooker insert, placing it fat-side up.
04 - In a medium 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.
05 - Pour the sauce mixture evenly over the seasoned chuck roast, ensuring it pools around the base of the meat.
06 - 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.
07 - Carefully remove the roast from the slow cooker and transfer to a large cutting board. Using two forks, shred the beef along the grain into bite-sized pieces, discarding any large pieces of fat.
08 - Return the shredded beef to the slow cooker and stir gently to coat all the meat in the sauce. Serve hot on burger buns topped with coleslaw, or over rice as desired.