Penuche Frosting

Penuche Frosting 

1/2 cup butter

1 cup brown sugar

1/4 cup milk

1 3/4 to 2 cups sifted powdered sugar

Melt butter in a medium saucepan, add brown sugar and bring to a boil. Over low heat, boil for 2 minutes, stirring constantly. Stir in milk, bring mixture back to a boil, stirring constantly. Cool to lukewarm, then gradually stir in powdered sugar. Beat until thick enough to spread. If frosting is too stiff it can be thinned with a little hot water.