about this cake is that it can be whipped up using a bowl with a wooden spoon in about 3 minutes, provided that your butter is at room temperature.
butter and flour a 8" round cake pan. cream sugar and butter in a bowl. add eggs and beat well. add flour, baking powder, and beat well.
spoon the batter into the prepared pan. place the plum halves skin side up on top of the batter, being sure to crowd the pan. you may have to use an extra plum or two, depending on how big your plums are. sprinkle lightly with the cinnamon and sugar.
bake for 40 to 50 minutes or until 