Best frosting ever!

So I recently made this frosting 4 some cupcakes, and it was absolutely delicious! It's great for piping on cupcakes, or cookies, as it's thick-ish (it can be made thinner, though).
Ingredients:
1/2 cup softened butter
1/2 cup cream cheese
small spoonful milk (more or less, depending on the consistency you're going for)
1 cup icing sugar

Stepz:
Cream the butter and cream cheese together, until well mixed. Add a small spoonful of milk, and add icing sugar 1 cup at a time. If you want a thinner consistency, simply add more milk. Store in a container in the fridge.