Brownie Fudge Frosting

1/2 c butter
1/2 c cocoa
1# powdered sugar
1/3 c milk
1 t vanilla

Melt butter in microwave. Stir in cocoa until smooth. Return to microwave and nuke 1 minute or until mixture begins to boil. In mixing bowl add powdered sugar. Beat in melted cocoa until mixture starts to set up. Pour onto brownies and let cool completely before cutting.