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HEAT oven to 400°F.
COMBINE first 5 ingredients. Stir in 1/2 cup mozzarella; spoon into shells.
SPREAD half the sauce onto bottom of 13x9-inch baking dish. Place shells in dish; top with remaining sauce and mozzarella. Cover.
BAKE 40 min. or until heated through, uncovering after 30 min.