MIX crabmeat, 1/4 cup of the bread crumbs, the mayo, egg, barbecue sauce and onion until well blended; cover. Refrigerate 2 hours.
SHAPE crabmeat mixture into 8 patties; coat with remaining 3/4 cup bread crumbs. Spray each patty on both sides with cooking spray.
MELT butter in large skillet on medium heat. Add patties; cook 4 to 5 min. on each side or until firm and golden brown on both sides.