Simple Sponge Cake Be The First To Review By Anonymous recipe Comments | 0 Favorites | 66 Print This is a simple sponge cake that can be made in no time at all with only three ingredients. What have you got to lose? Simple Sponge Cake Ingredients 3 eggs1/2 cup castor sugar or superfine sugar2/3 cup self-rising flour Instructions 1 Preheat the oven to 375 degrees F (190 degrees C). Grease an 8 or 9 inch round cake pan. 2 In a medium bowl, whip together the eggs and castor sugar until fluffy. Fold in flour. Pour into the prepared pan. 3 Bake for 20 minutes in the preheated oven, or until the top of the cake springs back when lightly pressed. Cool in the pan over a wire rack.