Preheat oven to 350 degrees and grease a 8 in. square baking pan.
In a small sauce pan bring butter, brown sugar and milk too a boil.
Stir lightly and then reduce heat. Leave on heat for about one minute, and then remove from heat.
Let cool COMPLETELY, and add in confectioners’ sugar, the more you add the thicker it will get.
Stir well with a spoon until smooth.
Icing your brownies.
Serve and enjoy!