INGREDIENTS
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12 tablespoons (1 1/2 sticks) unsalted butter, room temperature
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1 cup confectioners’ sugar
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Grated zest of 4 tiny or 2 large key limes
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2 tablespoons freshly squeezed lime juice
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1 tablespoon pure vanilla extract
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1 3/4 cup plus 2 Tablespoons all-purpose flour (a.k.a. 2 cups minus 2 tablespoons)
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2 tablespoons cornstarch
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1/4 teaspoon salt