Caramel Cake - cooking recipe

Ingredients

Duncan Hines golden butter cake mix, cooked as directed (3 layers)
1 stick oleo
1 small can Carnation milk
1 box powdered sugar
1/3 box brown sugar (add later)
1 tsp. vanilla (add later)

Preparation

Mix brown sugar, oleo, 1/2 box powdered sugar and milk.
Bring to rolling boil.
Remove from heat.
Add remaining powdered sugar and vanilla.
Stir until thick enough to spread.
If it gets too thick, add 1 teaspoon of water.