Pre-heat the oven to 170°C (340°F)
Grease the sides and line the base of a 22 cm (8-9 inches) spring form cake tin.
Separate the eggs into two small blows. Put aside.
Combine the flour and baking powder and mix well. Put aside.
Mix the vanilla into the milk. Put aside.
Add the egg white into a large mixing bowl, using an electric mixer, beat the egg whites on high speed for about 3 – 5 minutes, or until it the whites have become thick and frothy.
Gradually the add the sugar to the egg whites, beating on high speed for about 3 - 5 minutes or until the egg whites are thick and glossy looking.
Still on high speed, add the egg yolks one at a time, beating well between each addition.
Reduce speed to medium. Slowly and alternating, add the flour and the vanilla milk and mix until combined. Turn the mixer off.
Use a spatula to scrape down and clean the inside of the bowl and fold it into the batter.
Pour the batter into the prepared cake tin, gently tapping the filled tin on the bench several times before placing into the in the pre-heated oven. Bake for 20-25 minutes or until a skewer inserted into the centre of the cake comes out clean.
Remove from the cake from the oven and allow to stand in the tin for 5 minutes.