Peanut Butter Cake
["1 box Duncan Hines butter flavored cake mix", "3 eggs, beaten", "1 stick margarine", "2/3 c. milk", "1/2 c. peanut butter", "1/2 c. oil"]
["Mix and bake according to directions on box."]
["butter", "eggs", "margarine", "milk", "peanut butter", "oil"]