Whisk Corn Oil (35 milliliter) and Milk (40 milliliter) to combine. Sift in Cake Flour (30 gram) and Corn Flour (20 gram), roughly mix. Then add Egg (3), Vanilla Extract (1/2 tablespoon) and Salt (1 pinch), mix batter well till smooth.
With an electric mixer, whisk Egg Whites at low speed to foamy, gradually add Caster Sugar (45 gram) in 3 batches and beat at medium high speed until stiff peaks form.
Fold egg white into egg yolk mixture till well combined with a rubber spatula.
Pour batter into an ungreased removable 7-inch cake pan. Bake in preheated oven at 150 degrees C (300 degrees F) for about 45-50 mins.
Invert cake pan immediately on a wire rack and let to cool completely after baked. Enjoy!