I've been cooking for almost 50 years and still have the same problem. Whenever I cook muffins, cupcakes, cookies -- whatever -- they rise nicely while they're cooking, but by the time I take them out of the oven they're flat as a pancake. That just happened this afternoon with vanilla cupcakes, my grandson's favorite.
I have a gas oven. I turn the pan half-way through baking so they'll bake evenly. I followed the directions exactly. The recipe was for 12 cupcakes, and that's what I made. I'm so frustrated!
I'd appreciate any advice.