Buttercream Icing Recipe

What a difference a really good buttercream recipe makes.  I used to just mix a bit of butter and milk to icing sugar and it tasted okay, but after following this recipe, I won't go back to winging it.  People commented on how good it was the first time I used it/

Buttercream Icing Recipe

1 cup unsalted butter, softened
4 cups icing sugar
1/4 tsp salt
1 Tbsp vanilla Essence
up to 4 Tb milk

Mix together all ingredients except the milk.  Start adding the milk a bit at a time until you have the desired thickness/stiffness you want.