How do I keep my sponge cake from deflating?

Chef's answer
Carefully fold the beaten egg yolks in thirds into the beaten egg whites. Incorporating small amounts of the egg yolks keeps the egg whites from deflating and the cake from falling..
Frequently asked Questions 🎓
There is a trick to prevent sponge cakes like Angel food cakes from sinking: cool these cakes upside down! By cooling the cake upside down, the cake has plenty of room to stretch out of the pan, instead of collapsing into the bottom of the pan.
Carefully fold the beaten egg yolks in thirds into the beaten egg whites. Incorporating small amounts of the egg yolks keeps the egg whites from deflating and the cake from falling..
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