"These butter cookies are simple but so good! Melt-in-your-mouth tender, & perfumed with sweet vanilla, with a crunchy sparkling sugared edge...."
INGREDIENTS
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1 cup unsalted butter (softened)
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1/2 cup granulated sugar
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1/2 cup powdered sugar
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1 egg (large (separated))
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1 teaspoon vanilla bean paste (or vanilla extract)
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1 1/2 cups all-purpose flour
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1/2 teaspoon kosher salt
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1/3 cup sparkling sugar (approximately)