Nancy, if you were adding a larger amount of natural cocoa powder (say 1/4 cup), then you'd probably want to use a lesser amount of baking soda in place of the baking powder and up your liquid accordingly. Since this is such a small amount, however, we'd be inclined to keep the leavening agent the same, just adding a touch more liquid if the dough feels to you like it needs it. Hope this helps! Mollie@KAF

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