"Buttery sables cookies with a double vanilla punch of flavor...."
INGREDIENTS
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2 sticks (8 ounces) unsalted butter, at room temperature
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½ cup granulated sugar
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¼ cup powdered sugar
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1 teaspoon vanilla bean paste
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2 large egg yolks, at room temperature
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½ teaspoon fine sea salt
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2½ cups all-purpose flour
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¼ cup cornstarch
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1 large egg white, lightly beaten
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¼ cup vanilla sugar