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Preheat oven to 400 degrees
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Coat baking dish with 1 tablespoon butter
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Cook potatoes in boiling salted water for 15 minutes or until very tender
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Drain water, transfer to mixing bowl
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Add milk and melted butter and mix together
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Mix in the Mozzarella cheese and 3/4 Parmesan Cheese
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Season with salt & pepper
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Pour mashed pototatoes into greased baking dish
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Mix bread crumbs and remaining Parmesan Cheese together, add to top of mashed potatoes
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Bake, uncovered in oven for 20 minutes
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Serve hot