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Heat oven to 400°F.
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Place a layer of sauce in bottom of skillet of baking dish
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Mix cottage cheese, spinach, ½ cup mozzarella, ½ cup Parmesan and salt and pepper; spoon into pasta shells. Place shells on top of sauce layer.
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Add additional sauce on top of shells.
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Bake 25 min. or until thoroughly heated. Top with remaining cheese and bake additional 5 minutes.