I'll answer you! I personally would add a few squares of melted unsweetened chocolate to half of the vanilla batter for a really chocolatey flavour - hope that helps! The vanilla will help to increase the chocolate flavour too!
Thanks!
I thought cocoa might not work, because I would be compromising the mixture with more dry ingredients.
Now I do have to ask, why unsweetened chocolate? I have accidentally tasted it, and blech. Is it because adding semi sweet would make it too sweet?
Unsweetened is as pure as you can get and therefore the best for chocolate flavour - it's not meant for eating in it's raw state! Semi-sweet would add more sugar/sweetness to the cake, but you won't get the same chocolate kick from it, hope that helps!
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