Preheat oven to 400 degrees F (180 degrees C) Melt
the butter in a saucepan
until it is liquid, and keep warm, not hot. In a double broiler, place the egg yolks and the sugar, mix until well blended and frothy
. Using a sieve
, sprinkle the flour and chocolate powder into the egg
yolk mixture. Pour the butter
into the egg yolk mixture and stir until blended. Fold the egg whites into the mixture Pour the mixture into a greased 12-inch round pan. Bake for 35 minutes. Note: Will cut the biscuit into three horizontal disks. These disks will form the layers of the cake.