In a bowl, put all ingredients except oil, and beat the ingredients using hand mixer.
Mix for about 2 minutes until lighten and a bit whiter (until you reach ribboning stage), then add in oil and beat for about 30 seconds.
Pour the mixture into a 5�x5�x4 cake round pan.
Bake at 170c for 12 minutes or until a toothpick inserted in the center comes out clean.
Take out from the pan, and let it cool completely on the wire rack.