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Do I need to double the quantity of baking powder,when all other ingredients are doubled for preparing simple sponge cake?

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  • I'd bake 2 regular sized cakes instead of one bigger cake; better control over the baking (IMO)
    – Max
    Commented Jan 22, 2018 at 11:59

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For doubling a recipe, yes, you double the amount of baking powder. Issues with increasing a recipe rarely cause trouble until you get to 4x or more.

For baking though, you do want to make sure the depth of the cake is the same as for the original recipe though so that it bakes properly in about the same amount of time.

This recipe from Bon Appetit is a sponge cake for a 13"x 9" pan or a 9" round cake pan. It mentions that you can double it for a two-layer cake with no other adjustment for the baking powder.

A common mistake may be to also double mixing time -- which you do not want to do since that can cause gluten development.

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Yes, that's exactly what you should do.

The amount of baking powder was calculated for the original amount if batter by the recipe writer (or figured out via trial and error). So if you use n-times the recipe, this also means n-times the baking powder.

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