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1 stick unsalted butter, softened
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One 8-ounce container mascarpone cheese, softened
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3 cups confectioners' sugar, sifted
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1 teaspoon pure vanilla extract
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In a bowl, beat the butter until smooth. Beat in the mascarpone cheese until combined. Add the sugar and vanilla and beat until smooth. Refrigerate the filling until it is slightly firm, about 2 hours.
Make Ahead
The mascarpone filling can be refrigerated for up to 1 day; let stand at room temperature until softened slightly before using.