Why add baking powder when creaming sugar and butter?

۲۴ دی ۱۳۹۶ تغذیه

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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