I have had this recipe for over 30 years. Cream may be substituted for the milk for added richness.
1 In a saucepan over medium heat, melt the butter, and mix in 3 tablespoons milk and brown sugar. Boil vigorously for 1 minute.
2 Remove from heat, and beat in 1/2 cup confectioners’ sugar. Cool slightly, and beat in the vanilla and remaining 1/2 cup confectioners’ sugar. Add more milk if the mixture is too thick.