"Chocolate-lovers will devour this cocoa version of snowballs, the classic holiday cookie. To make them, kids get to throw snowballs in "mud" (a dust of cocoa and confectioners' sugar)...."
INGREDIENTS
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1 cup (2 sticks) unsalted butter, softened
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2 ounces unsweetened chocolate, melted and cooled
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2/3 cup confectioner's sugar
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1 egg yolk
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11/2 teaspoons vanilla extract
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2 cups all-purpose flour
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1/4 teaspoon salt
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3/4 cup finely chopped walnuts
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3/4 cup confectioner's sugar
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3 tablespoons unsweetened cocoa powder