Put the potatoes in a large pot and cover with cold water; salt the water liberally. Bring to a boil and cook until tender, 8 to 10 minutes. Drain well and return to the same pot set over low heat. Mash until smooth with a potato masher. Add the butter, Parmesan and salt and pepper to taste. Mash until the butter has melted. Stir in the scallions. Serve sprinkled with Parmesan and scallions.
Copyright 2016 Television Food Network, G.P. All rights reserved.