Mix eggs and sugar. Add to yogurt, the oil, baking soda, vanilla and flour, which is added baking powder. Pour the mixture into a greased with sunflower oil and sprinkled with flour pan. Sprinkle with crushed walnuts. Bake in a moderate oven. After baking, sprinkle with powdered sugar. With a glass cut figurines shaped moon. The base may be baked in a rectangular pan, then baking to bake with jam or marmalade and rolled.