Peanut Butter Fudge Cake

Ingredients:
- 1 chocolate cake mix
- 1 1/2 c. peanut butter
- 1 1/2 Tbsp. peanut oil
- 1/2 c. sugar
- 1/4 c. cocoa
- 6 Tbsp. butter
- 1 box powdered sugar
- 1 tsp. vanilla

Directions:
- Bake cake mix according to directions on box; use a 9 x 13-inch pan.
- In a small bowl, mix peanut butter and peanut oil until smooth.
- Spread on cake.