Prepare ribs: Remove the silver skin/membrane from the back of the ribs for tenderness. Season both sides with salt, pepper, and smoked paprika.
Mix sauce: In a bowl, combine barbecue sauce, brown sugar, apple cider vinegar, smoked paprika, garlic powder, onion powder, cayenne (if using), and Worcestershire sauce.
Place ribs in crockpot: Coil or layer ribs in the slow cooker. Pour the smoky BBQ sauce over the ribs, coating evenly.
Slow cook: Cover and cook on low for 6–7 hours or on high for 3–4 hours until ribs are tender and meat easily pulls away from the bone.
Optional broil: For a caramelized finish, preheat oven broiler. Place ribs on a baking sheet and brush with extra BBQ sauce. Broil for 3–5 minutes until sauce is slightly charred and sticky.
Serve: Slice ribs between bones and serve hot with additional sauce if desired.