Anyway, when I finally found some time to bake...
The chocolate cake base recipe is taken from my earlier chocolate fudge cake post. Fill cupcake cases 3/4 full of batter and bake till cake is springy or inserted toothpick comes out clean. I did cut down slightly on the sugar, since the frosting's pretty sweet.
For the peanut butter frosting, mix 1 cup creamy peanut butter with 1/2 cup icing sugar till smooth. Add a smidgen of milk if mixture seems too thick.
Ah, peanut butter and chocolate. Such and ideal combination.