Heat the oven to 180°C and line a 20 cm tin.
Whisk the eggs and sugar for 8 minutes until pale and thick.
Sift in the flour and baking powder and fold gently.
Fold in the milk and vanilla, pour into the tin and bake for 25–30 minutes.
Cool for 10 minutes in the tin, then turn out.
NIKO tip
Fresh egg whites trap more air, so the sponge rises higher.