So when you are making a peanut butter cup cake, do you put the peanut butter in the cake or make it as a filling? What tastes better? Thanks!
I think you mean "peanut butter cupcake" and not "peanut butter cup" cake, right? If so, I like to make a peanut butter cake batter, fill up the cupcake tins about 1/2-2/3 way full and then put a minute peanut butter cup in the center of the batter, such that the top of the minature cup is in line with the top of the batter. Then I frost with chocolate frosting. Sometimes I put more peanut butter in the frosting.
All and all - I would recommend having the peanut butter in at least a filling or in the frosting. I find that the flavor is too subtle if it's only in the cake.
All this talk about peanut butter is getting me hungry! 
Sorry that was a bit confusing! I meant to say a peanut butter cake! Although I love the cupcake idea too! Many people call the cake they offer peanut butter cup cake like the candy! Sorry about the confusion but thank you for the tips!
I see. I'd put peanut butter in the batter and in the frosting. I made a cake awhile ago where I combined the following ingredients, poured into 2 large circular cake pans, and then frosted with a peanut butter chocolate frosting. Then I decorated it with crushed peanuts and minature chocolate peanut butter cups.
1 c peanut butter
1 c butter, softened
8 eggs
2 packages yellow butter cake mix
1 1/3 c water
Have fun!
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