– ½ cup (113 g) unsalted butter – 1½ cups (180 g) all purpose flour – 1 teaspoon cornstarch – ½ teaspoon baking powder – ½ teaspoon salt – ¾ cup (150 g) granulated sugar – 1 large egg, room temperature – 1 teaspoon (5 ml) vanilla extract – ¼ cup (30 g) powdered sugar for dusting optional
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