1 box yellow cake mix, follow directions on box
3/4 c. peanut butter
2 tbsp. powdered sugar

Mix cake according to directions on box and add peanut butter and sugar. Mix well.

Bake at 350°F until done.

Icing:

1 can vanilla icing
1/2 c. peanut butter
2 - 3 tbsp. powdered sugar

Mix well and spread on cake.