1 box yellow cake mix (Duncan Hines)
1/2 c. water
2 tbsp. peanut butter

Icing:

3 c. sugar
1 c. milk
1 stick butter
2 tbsp. peanut butter
tbsp. vanilla extract

Mix cake mix by directions on box. Add water and peanut butter. Cook by directions on box.

Icing: Place ingredients in saucepot. Cook until forms soft ball in cold water. Then add peanut butter, butter and vanilla. Mix and spread.