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HEAT oven to 350°F.
COOK and stir onions in butter in large saucepan on medium heat 5 min. or until crisp-tender. Add 1/2 cup Cheddar and remaining ingredients; mix well.
SPOON into 1-qt. casserole.
BAKE 30 min. Top with remaining cheddar; bake 5 min. or until melted.