Everyday Food, October 2005
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4 tablespoons unsalted butter, room temperature
2 cups confectioners' sugar
2 tablespoons milk
1/2 teaspoon vanilla extract
1 pinch salt
In a small bowl, beat together butter, sugar, milk, vanilla, and salt until light and fluffy.
Use immediately, or cover with plastic wrap and refrigerate up to 3 days. Before using, bring to room temperature.