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HEAT oven to 400ºF.
COMBINE first 4 ingredients, 1/4 cup Parmesan and oregano.
SPOON into 13x9-inch baking dish or 3-qt. casserole; cover with foil.
BAKE 35 min. Sprinkle with remaining cheeses; bake 5 min. or until mozzarella is melted.