Eggs and sugar with a mixer nice break. Baking powder and yogurt, mix thoroughly in a separate cup and add to beaten eggs and sugar, stir again with a mixer. Under constant stirring, lemonade. With constant stirring, the oil, flour, bread crumbs, the walnuts, grated apples and cinnamon. This slurry is poured into a greased and floured baking tin. Bake in preheated moderate oven. While still warm, sprinkle cake with powdered sugar.