Preheat oven to 375.
PLace small nonstick skillet coated with cooking spray over medium heat; add onion. Saute 5 to 7 minutes. COmbine onion, whole kernal corn and next 5 ingredients in a bowl. Stir in 1/2 cup cheese.
Pour into 10 in ddep dish pie plate coated with cooking spray. Combine remaining cheese and cornflakes; sprinkle over corn.
Bake for 50 minutes or until top is browned and mixture is set in the center.
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