2 cups icing sugar
2 to 4 tablespoons milk or water
1 tablespoon softened butter, optional
1/2 teaspoon vanilla extract, optional
Sift the icing sugar into a bowl
Add the milk or water a little at a time
Add the butter and vanilla, if using
Stir until smooth and spreadable
Add more icing sugar to thicken
Add more milk or water to thin
Use immediately on cakes, cookies, or cupcakes