You can mix pb with bc to make a very yummy pb bc. I've used it on brownies before, don't see why if couldn't be used on chocolate cake.
I use the pb in bc icing all the time, one of my most requested cakes. I used the reese's pb chips for the actual cake mix as well. Mmmmm, getting that sweet tooth going...
I have 2 pb bc recipes posted on here, this one is heavier, more like fudge:
http://cakecentral.com/cake_recipe-6804-5-Peanut-butter-buttercream.html
And this one is kind of lighter, melt in your mouth:
http://cakecentral.com/cake_recipe-7388-6-Peanutbutter-Fluff-Buttercream.html
They're both delicious and I decorate with them but I think I'm going to be using that last one from now on, it's sooooo yummy!!
I'm assuming you're wanting a chocolate pb cake flavor? If so, why not sub the butter mix w/ a chocolate mix in this recipe. Now you have my wheels turning!!!! I may have to try a chocolate pb cake & pb mousse w/ vanilla bc would be yum! http://www.cakecentral.com/cake_recipe-4233-Peanut-Butter-Cake-VII.html
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