How to make
Beat the eggs and sugar with a mixer, add the vanilla, baking powder and baking soda. Beat about 5 min, followed by the addition of the flour.
Smear a cake form with oil and put in half of the mixture. Mix the other half with cocoa or chocolate. Pour the chocolate mixture on top and put it to bake in a preheated 390°F (200 °C) oven.
Optionally, you can sprinkle the cake with powdered sugar.