INGREDIENTS
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12 Tb (1 1/2 sticks) unsalted butter, softened
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1 cup sugar
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2/3 cup dark, dutch processed cocoa powder, sifted, plus extra for rolling
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1 large egg
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1 1/2 tsp vanilla extract
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1 1/4 cup flour, plus extra for rolling
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3/4 tsp cinnamon (optional)