Prepare the baking - if not silicone, smeared with butter and dusted with flour or semolina. Beat egg whites in snow. The butter mix with sugar, add egg yolks one by one, the oil, milk and broken well. The flour is sieved and mixed with the baking powder and gradually added to the liquid mixture. Mix well and gradually, stirring with a wooden spoon, add the beaten egg whites. Optional can add walnuts or raisins. May separate a part of the dough and mixed with cocoa and then to return to the other side and slightly pulled. Pour the mixture into the prepared form and bake in a moderate oven.