Ingredients

1 cup milk 

4 tablespoons (1/2 stick) unsalted butter 

1 tablespoon pure vanilla extract 

8 cups confectioners' sugar, sifted 

1 cup cocoa powder, sifted 

Preparation

Place the milk and butter in a small saucepan over medium heat, and heat until butter is melted. Transfer to a medium heat-proof bowl; add the vanilla extract, confectioners’ sugar, and cocoa powder. Stir until combined.