Chocolate + Peanut Butter + Cupcakes = Yes. At first I thought it was chocolate chip cookie dough on the very top-- which makes me think that could be tried, too. Chocolate batter, gob of peanut butter in the middle, cookie dough on top.
This is the BEST VANILLA CUPCAKE RECIPE ever! They are soft and moist but firm enough to not fall apart when you bite into them. Top them off with buttercream icing and they are heavenly! From cakewhi (Cup Cake Recipes)