1/2 c. butter
1 c. light brown sugar, packed
1/3 c. milk
3 c. confectioners' sugar

Melt butter. Add light brown sugar. Cook over low heat 2 minutes, stirring constantly. Add milk. Cook and stir to a boil. Cool 10 minutes, then add confectioners' sugar until spreading consistency, beating well after each addition. Makes enough to frost two layers of top of 9 x 13-inch cake.