In addition to mascarpone, De Laurentiis adds chicken broth, garlic, Parmesan, and butter to her mashed potatoes to give them a rich flavor and creamy texture. To try this for yourself, add 1 cup of mascarpone per 4 pounds of potatoes, or for a less fatty (and less rich) option substitute crème fraîche, clotted cream, ricotta, or cream cheese instead of mascarpone.