Simple is sometimes the best...
250g/8.8 oz butter, softened
225g/8 oz sugar
2 teaspoons vanilla extract
400g/14 oz self raising flour
160ml/5.6 fl oz milk
Preheat the oven to 180C/350F/Gas 4.
Grease and line a 9"/23 cm cake tin.
Whisk the butter, sugar and vanilla together until light and fluffy.
Alternate adding a little of the egg, then some of the flour then a little milk, stirring to combine. Keep alternating until you have all the ingredients mixed together.
Spoon into the tin and smooth the top.
Bake for one hour.