peanut butter cupcakes

Success:
The use of yogurt in the cupcakes made them so fluffly and chomping them down while they were still warm was an absolute bliss.

Failure:
There was a nuclear explosion in my lab! The cupcakes flowed like larva crazily in the oven while baking. Each one turned out ugly and likened to a has-been volcano eruption. I really didn't want to take a picture, but thank God the middle ones in the tray had not much space to 'explode' except upwards, so I had 3 decently 'normal' ones to present them sheepishly here. Perhaps I was too generous and overly excited with the use of yogurt. So should I compromise with looks for fluff? I'll try again but this time using tall muffin cases to give the 'explosion' more direction. :)