Eggs are broken with 2/3 of sugar. Add the flour, margarine and yogurt, with baking powder dissolved in it. Pour dough into greased with sunflower oil and sprinkled with flour pan. Plums are cut in half and remove pits. Remaining sugar mixed with cinnamon and plums Oval in the mixture. Arrange 2/3 of the plums on the dough and bake in a preheated oven at 180 C for 40 minutes and 25 minutes after baking cake placed on other plums. The finished cake sprinkled with powdered sugar.