I just finished baking a sponge cake using a sponge cake mix when my SIL, Catherine, came over to my house. After tasted the freshly baked sponge cake, we both find it to be a bit dry. I told her that I was desperately looking for a recipe that would give me the kind of sponge cake which is moist, spongy and fluffy. The one that we usually buy from the shop. "That is Japanese cotton sponge cake" she said. And I quickly checked the recipe from the internet and tried it out. The texture turned out to be very well. Check out the recipe here.