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HEAT oven to 425°F.
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PREPARE dinner in large saucepan as directed on package.
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TOSS chicken with wing sauce; stir into Dinner. Spoon into 1-½ qt. casserole sprayed with cooking spray; top with shredded cheese.
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BAKE 5 to 10 min. or until cheese is melted. Sprinkle with onions.