I have no idea what is going on with my cupcakes recently. I am using the same recipes that I have used in the past, exactly the same measurements, etc...but the past two times I have made cupcakes (chocolate and WASC) the cupcakes looked fine when I pulled them out of the oven, but when I let them cool, they shrank significantly (by about 1/3 to 1/2 size). They didn't sink, they actually shrank in diameter. I have no idea what is going on. Any ideas?

I had this happen to me recently with chocolate cupcakes. Some of them were fine, but others shrank. Thank goodness I put enough buttercream on them that they didn't look strange, but the whole experience freaked me out. ha! I would love to know the answer to this mystery too.

It's usually caused by overbaking or leaving them in the pans too long once they are out of the oven. I remove mine to cooling racks immediately after I take them out.