The key to smooth, silky mashed potatoes is using a food mill rather than a potato ricer. Parmigiano-Reggiano gives these mashed potatoes a distinctively Italian flavor.
Scrub the potatoes and put them in a medium saucepan. Add enough water to cover the potatoes by 1inch and place over high heat. Cover the pan and bring to a boil, then adjust the heat so that the water simmers. Cook until the potatoes are tender when pierced, about 30 minutes. Try