"Shortbread cookies couldn't be simpler. Butter, sugar, powdered sugar, salt, a few eggs and some flour. Shortbread cookies are great anytime, but they're lovely decorated in sugar for the holidays...."
INGREDIENTS
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1 cup unsalted butter (softened)
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1/2 cup granulated sugar
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1/4 cup confectioners' sugar (sifted)
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1/2 teaspoon salt
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3 large egg yolks (divided)
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2 cups all-purpose flour
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course sugar or nonpareils (optional)