In a medium mixing bowl, whisk or beat all ingredients with an electric mixer until well combined. Whisk in food coloring if desired.
- This icing is fluid and easy to work with but dries beautifully shiny and hard within 24 hrs., so cookies may be stacked for storage, transport or gifting.
TASTY TIP: Whisk in a bit of cocoa powder to make a chocolate brown icing (great for reindeer cookies!).