Marble Cake

Mix the egg yolks with powdered sugar and vanilla into the foam. Add oil, milk and flour mixed with baking powder.  Mix all thoroughly.  We whisk egg whites with a pinch of salt into hard foam. Gently stir of dough add stiffly beaten egg whites. Thou shalt anoint oil a form and sprinkle with flour. We pour into molds 2/3 of the dough.  Put in the rest of the dough to 2 tbsp. cocoa and stir.  Pour the white dough. Bake in a preheated oven at 180 ° C for about 45-50 minutes. We check if with Toothpick the cake is baked. The dough can add raisins, chopped nuts, chopped chocolate pieces and the like.