Preparation: Preheat the oven to 150°C (300°F). Line the bottom of a 20cm (8 inch) square cake tin with parchment paper.
Mix Wet Ingredients: In a bowl, combine the egg yolks, milk, oil, and vanilla extract.
Sift Dry Ingredients: Sift the cake flour and cornflour into the egg yolk mixture. Whisk until smooth.
Whip Egg Whites: In another bowl, beat the egg whites until frothy. Gradually add sugar and continue beating until stiff peaks form.
Combine: Gently fold the egg white mixture into the...