If you want a very light and fluffy sponge, separate the egg yolks from the egg whites and whisk the egg whites until they can form peaks. Then fold them gently into the mixture.
Grease two round cake tins and put them into an oven pre-heated to around 160 degrees for approximately 15 minutes. Check them carefully after 15 minutes and they should have risen and gone slightly golden on top. Check with a cake tester or long, thin knife in the centre of the cake. If it comes out with mixture on it, it needs a little longer. (Put the knife/cake tester in hot water and wipe dry before putting it in the cakes so it won't cause them to go soggy in the centre).
Now, if the cakes are golden brown on top but not yet cooked in the middle, place some greaseproof paper over the top and put them back in. Check every two to three minutes until they are done and turn out immediately onto a cooling rack.
If you want to do vanilla buttercream icing, mix a little butter with icing sugar and 2-3 drops of vanilla essence. You don't need much butter, so remember that you can add more if there isn't enough.
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