INGREDIENTS
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1 stick (1/4 lb.) unsalted butter, at room temperature
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1/2 cup sugar
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1 egg yolk
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1 teaspoon vanilla extract
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1 1/4 cups flour
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1/2 teaspoon salt
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Green sugar
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5 long strands black licorice, cut into 1-inch lengths
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36 white-chocolate chips
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36 brown mini M&Ms