Preheat oven to 350 degrees. In a large mixing bowl, combine flour, sugar, baking soda, and salt; set aside.
In a saucepan, bring water and butter to a boil. Stir in peanut butter and oil until blended. Add to dry ingredients; mix well. COmbine eggs, buttermilk and vanilla; add to peanut butter mixture. Mix well.
Pour into a greased 15 x 10 x 1 inch baking pan. Bake 18 minutes. Meanwhile, combine sugar,milk, and butter, in a saucepan. Bring to a boil, stirring constantly.
Cook and stir for 2 minutes. Remove from the heat. Stir in the peanut butter, marshmallows and vanilla until marshmallows are melted. Spoon over warm cake and carefully spread over the top. Cool completely.
Originally Submitted
12/13/2011
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