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MIX meat, 2 Tbsp. barbecue sauce, bread crumbs and egg just until blended; shape into 4 (1/2-inch-thick) patties. Place on rack of broiler pan.
BROIL, 6 inches from heat, 4 min. on each side. Brush with half the remaining barbecue sauce; broil 1 to 2 min. or until burgers are done (160°F), turning and brushing occasionally with remaining barbecue sauce. Top with Singles; broil 1 min. or until melted.
SERVE in buns.