INGREDIENTS
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Time: about 30 minutes, or more if cookies are baked in batches
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1 1/2 cups all-purpose flour
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1/2 cup cornstarch
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3/4 cup sugar
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Pinch salt
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2 sticks chilled unsalted butter, cut into bits
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1 teaspoon vanilla extract
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1 egg
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1/2 cup milk, approximately.