Beat the egg with half of the sugar to a thick, white foam. Fold in the rest of the sugar and the flour mixed with the baking powder and place in a greased dish. Bake at 180 ° C until light brown. Make a chopstick test.
I use 3 eggs for a tray, also for a cake, 2 eggs for a cake base and then cut through and use for two cakes. Always succeeds without separating the egg.