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A friend recently provided me with a family recipe for cookies which instructed me to cream together sugar and butter - so far so good. However, the thing that took me back was that the recipe called for adding baking powder along with the sugar and butter and creaming it all together.

I've never seen a recipe call for creaming anything more than just sugar and butter so I'm unsure if there is a valid reason for adding the baking powder at this stage. Does adding baking power during the creaming process do anything or is this recipe just odd?

As an an addendum, is there any reason you'd add anything besides butter and sugar during the creaming process?

FWIW, the cookies came out rather small and unlevened.

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    Could you post the whole recipe and method @zephyr? There's many reasons your cookies could have come out wrong. I do not see a good reason to cream the baking powder along with the butter, but maybe the recipe will give context. – GdD Jan 14 '18 at 8:46
  • @GdD The recipe itself wasn't very descriptive. My friend, I assume, knows the more detailed directions since its a family recipe and simply uses the recipe, as written, as a guide. The directions given to me though were simply to cream together the sugar, butter, and baking powder. – zephyr Jan 14 '18 at 16:13
  • did you get amounts? If so, what were they? – GdD Jan 14 '18 at 17:13
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I can't think of a reason to add the baking powder before creaming, but I can think of a few reasons not to:

Pretty much all baking powder these days is "double-acting". It provides leavening two different ways, under two different conditions: first, when it comes in contact with moisture, it produces carbon dioxide, and second, when it comes in contact with heat (in the oven). Adding the baking powder earlier than usual in a cookie recipe would trigger that first leavening earlier than normal, as soon as the baking powder comes in contact with the water in the butter. It's normally added at the end of the process so that as much of the CO2 as possible from the first leavening is still in the dough when it goes in the oven.

Perhaps more importantly, adding the baking powder to a creamed cookie dough very close to the end of mixing, along with the flour, keeps the agitation of the beater from beating too many of the carbon dioxide bubbles out of the dough. That's normally the first time the BP encounters moisture and starts that first leavening, and ideally not much mixing takes place after that step. Adding it before the creaming step begins would mean that any CO2 bubbles introduced by the first action of the baking powder aren't going to stand much chance of survival through the rest of the process, as the butter and sugar are creamed, eggs beaten in, etc.

Also, baking powder doesn't last forever, its leavening power decreases with age. Yours may just be old, or at least old enough that those two other factors were enough to affect the end product.

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I was thinking about this for a moment. Looked at few recipes and found out that there are few where the baking powder and sugar are mixed before adding the butter.

All of them used "I'm damn sure this is not a butter". So margarine, butter and hemp mixture, cocoa butter. Also one of them said about beating the mix to foam. So that, as mentioned by Dan C, may be the reason to add something that will bubble.

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