Peanut Butter Sheet Cake
["2 c. flour", "1 tsp. soda", "2 c. sugar", "1/2 tsp. salt", "1/2 c. oil", "3/4 c. margarine", "1/2 c. peanut butter", "1 c. water", "2 eggs, beaten", "1 tsp. vanilla", "1/2 c. buttermilk"]
["Mix together flour, soda, sugar and salt.", "Set aside."]
["flour", "soda", "sugar", "salt", "oil", "margarine", "peanut butter", "water", "eggs", "vanilla", "buttermilk"]