Silky Chocolate Butter Frosting - cooking recipe

Ingredients

3/4 cup sugar
1/4 cup all-purpose flour
3 tablespoons unsweetened cocoa
1 cup milk
1 cup butter, softened
4 semi-sweet chocolate baking squares, melted and cooled
1 tablespoon vanilla extract

Preparation

In 2-quart saucepan, combine sugar, flour and cocoa.
With wire whisk, gradually stir in milk until smooth.
Cook over medium heat, stirring frequently, until mixture has thickened and boils.
Reduce heat to low; cook 2 minutes, stirring constantly.
Remove from heat; cool completely.
In medium bowl, with mixer at medium speed, beat butter until creamy.
Gradually beat in milk mixture, melted chocolate and vanilla.