Its easy to increase the mix too if you need more since its a 2:1 ratio

2oz each of the flour, sugar & margarine per 1 egg

You'll need
4 oz Self Raising Flour
4 oz Caster Sugar
4 oz Margarine
2 large Eggs
1 tsp Vanilla Extract

How to make
Pre-heat your oven to 180c and grease a cake tin (or line a muffin tin with cases).

You'll need to cream the butter and sugar together until its light and fluffy.

One at a time, you'll need to add the eggs and allow to mix in between each one. This is where i love my standing mixer as makes life a lot easier. 

Gradually add the flour a little at a time and mix until its all combined nicely.

Pour into the tin (cases) and bake for 15-20 minutes (10-15 minutes for cupcakes) or until the top is golden brown and a knife comes out clean when inserted into the biggest part.

Decorate as you like :)