Ina Garten's Potato Basil Purée

There are so many variations on mashed potatoes — but this combination of potatoes and basil is a marriage made in heaven. Creamy potatoes and the fresh peppery basil really complement each other, and the Parmesan doesn’t hurt, either. Everyone asks for seconds! Adapted from "Barefoot Contessa How Easy is That?" by Ina Garten.