12 cup butter (no substitutions)
1 cup firmly packed light brown sugar
14 cup milk
2 cups confectioners' sugar
On stovetop melt the butter, add the brown sugar and boil over low heat for two minutes, stirring constantly. Add the milk, stir until the mixture comes to a boil again. Remove from heat and allow to cool to about room temperature. Slowly beat in the confectioners sugar, using more or less sugar depending on the consistency desired. Beat until mixture is thick enough to spread.