i will be making a full WASC batch (so, 2 boxed cake mixes). i need mostly vanilla cake because i will be doing a tier (4" high) of regular vanilla, but i also want to do a second, smaller tier of chocolate. I don't want to make half vanilla/half chocolate (2 seperate) batches because i just won't need that much chocolate.
so, my question is, after i fill my pans with the vanilla batter, how can i change the remaining batter to chocolate? i'm assuming just add some cocoa powder, but how much? and is there anything else i should add?
or, is this even plausible? SHOULD i just suck it up and make two seperate batches and have extra chocolate cake left over?
sorry, if this doesn't make sense 
thanks in advance!
I know this post is from 2009 but I would also really like to know the answer to her question.
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