1. Remove the membrane from the back of the ribs if needed, then pat the ribs dry with paper towels.

2. Rub the ribs lightly with olive oil on both sides.

3. In a small bowl, mix the brown sugar, smoked paprika, garlic powder, onion powder, chili powder, salt, and black pepper.

4. Rub the seasoning mixture all over the ribs, pressing it in well.

5. In another bowl, stir together the barbecue sauce, apple cider vinegar, and Worcestershire sauce.

6. Cut the ribs into sections so they fit inside the slow cooker.

7. Arrange the rib sections in the slow cooker and spoon some of the sauce mixture over them.

8. Cover and cook on low for 6 to 7 hours or on high for 3 to 4 hours, until the ribs are tender.

9. Carefully transfer the cooked ribs to a foil-lined baking sheet.

10. Brush the ribs with more barbecue sauce and broil for 3 to 5 minutes until caramelized and sticky.

11. Let the ribs rest for a few minutes, then slice between the bones.

12. Sprinkle with chopped parsley and serve warm.