Spend your free time cooking cream. Whip sour cream with sugar with a mixer. The cream will be thicker and airy, if you use fatty (preferably more than 26%, homemade product fits ideally in this case) sour cream.
Sour cream cakes are obtained low, but porous and very soft in structure. At the same time, the light cake will turn out to be slightly lower than the chocolate one, since a little less dough was used for its preparation.