The Mystery of the Fallen Cupcakes

The week of Halloween was Nicole's turn to choose treats for FHE, and she chose her favorite: cupcakes! I pulled a yellow cake mix out the cupboard and we had a great time putting the batter together. Put them in the oven as usual.... Waited..... The timer beeped and we pulled them out to cool till they were ready to frost.

So imagine my surprise when I turned around 10 minutes later and saw this:



I have never seen cupcakes do this before! Luckily, we have my mom's awesome recipe for chocolate frosting, so I just filled the craters with frosting and smoothed the tops to look like regular cupcakes. If anybody can solve the mystery of why this particular batch fell, though, I'd love to hear your explanation!