1. In Small Batter Bowl, combine half of the powdered sugar, butter, shortening, vanilla and 1 tablespoon of the milk. Beat with electric mixer until smooth.
2. Add remaining powdered sugar. Beat until light and fluffy, adding more milk, 1 tablespoon at a time, as needed for good spreading consistency.
3. Tint frosting with food coloring, if desired.

Yield: 3 1/2 cups