INGREDIENTS
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1 cup sugar
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4 tablespoons unsalted butter, at room temperature
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1/4 teaspoon salt
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1 egg
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1 teaspoon pure vanilla extract
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1/2 cup unsweetened cocoa powder
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3/4 cup flour
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Cocoa powder, for dusting
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1 egg white, beaten
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White nonpariels or coarse sanding sugar