Well, someone's got a sweet tooth. Don't worry, it's really easy.
What you'll need:
3 cups of sugar
1/2 a cup of butter
1-2 teaspoons of vanilla essence
1 tablespoon of milk.
How do we go ahead?
Take the butter in a large bowl and blend it. Add 2 cups of sugar and blend again. Mix thoroughly and add vanilla and a tablespoon of milk. Mix and add the rest of the sugar and keep mixin'.
If the frosting is too thin add a bit more sugar. If it's too thick add another tablespoon of milk. Mix until the required consistency is reached.
P.S. Try and avoid granulated sugar unless you want a crunchy frosting. It tastes great too.