- 1/2 cup butter or margarine
- 7 tablespoons root beer (not diet)
- 3 tablespoons unsweetened cocoa
- 1 (16-ounce) package powdered sugar
- 1 teaspoon vanilla extract
How to Make It
Bring first 3 ingredients to a boil in a large saucepan over medium heat, stirring until butter melts. Remove from heat; whisk in powdered sugar and vanilla until smooth.