1 cup packed light brown sugar
8 tbl (1 stick) butter
1/4 cup whole milk
2 cups sifted powdered sugar
Place the brown sugar and butter in a medium size saucepan over medium heat. Simmer, stirring constantly, until well combined--about 2 minutes. Carefully pour in the milk, stirring, and bring the mixture to a boil. Remove from heat and cool slightly.
Place the powdered sugar in your mixer bowl. Pour the brown sugar mixture over it. Beat on low speed until smooth and creamy, about 2 or 3 minutes.
Use immediately while still warm to frost the cake. The frosting may harden while you are working with it--in this case, warm it up for a few seconds in the microwave.
To use this frosting for the Cockeyed Cake, I would make just half a recipe.