Combine coffee, butter, cocoa, and vanilla; mix well. Slowly add powdered sugar; beat on med. speed until well mixed.
If the frosting is too thick you can add a little coffee or milk, if too thin add more sugar. Spread over cooled brownies. I like to spread chopped pecans over the frosting.
Recipe by Premeditated Leftovers™ at https://premeditatedleftovers.com/?p=516