3 tbsp. melted butter
2 tbsp. cocoa
1 1/2 c. confectioners' sugar
2 tbsp. milk
1 tsp. vanilla

In medium saucepan stir melted butter and cocoa until dissolved. Add confectioners' sugar, milk and vanilla. Stir until smooth. Add more milk if necessary to make a soft spreading consistency. Frost brownies, let set until firm.