Trim excess rib fat; cut into 2 to 3-bone sections.

Mix brown sugar, paprika, salt, pepper, garlic powder, and onion powder.

Press spice mixture onto ribs.

Stand ribs tightly packed in slow cooker.

Coat all sides with barbecue sauce.

Cook on low 6 to 8 hours until meat falls from bones.

For a crust, remove ribs, add more sauce, and broil 3-5 minutes.