Baked Mashed Potatoes, with Pancetta, Parmesan Cheese, and Breadcrumbs

Preheat the oven to 400 degrees F. Coat a 13 by 9 by 2-inch baking dish with the 1 tablespoon of room temp butter and set aside. Cook the potatoes in a large pot of boiling salted water until they are very tender, about 15 minutes. Drain ; return the potatoes to the same pot and mash well with a potato masher. Mix in the melted butter and milk. Mix in the mozzarella , 3/4 cup of the Parmesan and pancetta . Season, to taste, with salt and pepper and add in parsley. Transfer the potatoes to the prepared baking dish . Stir the bread crumbs and remaining 1/4 cup of Parmesan in a small bowl to blend . Sprinkle the bread crumb mixture over the mashed potatoes. Recipe can be prepared up to this point 6 hours ahead of time; cover and chill. Bake, uncovered, until the topping is golden brown, about 20 minutes. Serving Yield: 6 to 8