Pre-heat your oven to 180 degrees and put cupcake cases into a 12 hole cake tin.
Put all the ingredients into a bowl and mix them all together until you have a smooth cake.
Using two teaspoons, fill each cupcake case about 3/4 full then put in the oven for 20 minutes.
Once cooked, leave the cakes in the tin for a minute then transfer to a wire rack.
Once the cakes have cooled, make your icing by adding a tbsp at a time to the icing sugar until its thick enough that it wont run.
Add sprinkles if you want.