I tried out this recipe from Baking Mum. I could have over baked slightly, it turn out to be slightly dry.
250g butter, room temperature
200g caster sugar
1 tsp vanilla essence
300g self-raising flour (sifted)
½ to 3/4 cup of evaporated milk
1. Preheat the oven to 160°C. Line and grease an 8" round cake tin.
2. Beat the butter with the caster sugar until pale and fluffy. Add in eggs one at a time and mix well. Then add in vanilla essence and evaporated milk and mix well.
3. Lastly fold in sifted flour into the butter mixture and mix well. Pour into the prepare cake tin and bake for about an hour.
(I add some cocoa powder for the marble effect.)