4
In 2-quart saucepan, heat butter over medium heat, stirring constantly, until light golden brown. Remove from heat. Stir in icing sugar, vanilla and enough milk until smooth and spreadable. Immediately spread frosting over cooled bars. Refrigerate about 15 minutes or until set. For bars, cut into 8 rows by 6 rows. If desired, garnish each bar with orange peel strip.