I just baked a batch of yellow cupcakes and they fell. I have made this reciped dozens of times and went over the reciped again and don't think I missed anything. The only thing I did differently was that I did not use cupcake liners. I buttered and floured eat cup. Could that be the issues?? I have to rebake immediately. I need them in the morning.
I'm sorry I don't know, but I'll give you a bump.
Did you open the oven to check their progress at all during the baking? If you're on a dead line, I would just go get some cupcake liners and do it the way you've always done it, then experiment some more later without the liners so you can figure out what happened.
That happened to me once and it was the thermostat in the oven going out. Hopefully that's not what happened to your cupcakes, but if you have an oven thermometer you might check the oven temp.
also make sure your ingredients are not too old. i had this happen to me with a few of my cakes and i realized that it was because my self-rising flour was no longer good.
I did open the door after 18 minutes to check on the cupcakes and they needed a few more minutes, so I guess that could be it. I have never had that happen before. All the ingredients were new, so it had to be either me opening the door or the butter and flour in the cups. I would love to figure this out, so I don't do it again.
I had the same thing happen not too long ago while working on mini cakes, it turned out to be my oven not keeping the proper temperature. I agree with the previous posts and urge you to get an oven thermometer and see if this is the issue.