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COOK patties and onions in hot oil in large skillet on medium heat 10 to 12 min. or until patties are done, turning patties after 6 min. and stirring onions frequently.
CUT patties in half. Spoon onions onto bottom halves of rolls; cover with patties and cheese.
BROIL, 6 inches from heat, 1 min. or until cheese is melted. Cover with tops of rolls.