Quick Caramel Frosting
["1/2 c. butter", "1 c. brown sugar, packed", "1/4 c. milk", "1 3/4 to 2 c. sifted confectioners sugar"]
["Melt butter in saucepan.", "Add brown sugar; boil over low heat for 2 minutes, stirring constantly.", "Add milk, stirring until milk comes to a boil.", "Cool.", "Add sugar, beating after each addition, until spreadable."]
["butter", "brown sugar", "milk", "confectioners sugar"]