In a large mixing bowl, beat egg whites till frothy, add sugar in three (3) batches. Beat until soft peaks form, but not dry. You may use a stand mixer or an electronic mixer to beat the egg whites.
Bake the sponge cake in the oven. Once they are in the oven, turn the temperature down to 175°C (350°F) immediately. Bake for 20 minutes or until they turn light golden brown in color. Remove from the oven, let cool before serving.