"Note: To make superfine sugar as needed in the recipe, simply blend 1 cup granulated sugar until it is, well, super fine in texture. I don't remeasure after blending, I just pour it straight into the dough...."
INGREDIENTS
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2 1/2 cups plus 2 tablespoons all-purpose flour
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4 1/2 tablespoons dutch-process or regular unsweetened cocoa powder
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1/2 teaspoon cinnamon
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1/2 teaspoon salt
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1/4 teaspoon baking soda
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1 1/2 cups (3 sticks) butter, softened
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1 cup superfine sugar (see note above)
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Granulated sugar (for sprinkling)