01 - Combine smoked paprika, garlic powder, onion powder, kosher salt, black pepper, and chili powder in a small bowl. Mix until evenly blended.
02 - Pat the chuck roast dry and rub the spice mixture evenly over all surfaces of the meat, pressing gently to adhere.
03 - Set the seasoned roast in the slow cooker insert, fat side up.
04 - 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.
05 - Pour the sauce mixture evenly over the seasoned roast, ensuring the meat is well surrounded by the liquid.
06 - Cover the slow cooker and cook on low for 8 hours, or until the beef is fall-apart tender and shreds effortlessly with a fork.
07 - Transfer the beef to a cutting board and shred using two forks, discarding any large pieces of fat. Return the shredded meat to the slow cooker and stir thoroughly to coat with the sauce.
08 - Pile the pulled beef onto burger buns and top with coleslaw, or serve over rice as desired.