Peanut Butter Fudge Cake
["1 1/2 c. butter or margarine", "1/2 c. cocoa", "1 c. water", "1/2 c. plus 6 Tbsp. buttermilk", "2 eggs, well beaten", "2 c. sugar", "2 c. all-purpose flour, unsifted", "1 tsp. baking soda", "2 tsp. vanilla", "1 1/2 c. creamy peanut butter", "1 1/2 Tbsp. peanut oil", "1 box confectioners sugar"]
["Preheat oven to 350\u00b0.", "In a saucepan, combine 1 cup butter, 1/4 cup cocoa, water, 1/2 cup buttermilk and eggs.", "Stir constantly over low heat until mixture bubbles.", "In a large bowl, mix sugar, flour and baking soda.", "Stir hot mixture into dry ingredients.", "Beat until smooth.", "Stir in 1 teaspoon vanilla. Spread mixture evenly into a greased and floured 9 x 13-inch baking pan.", "Bake 25 minutes until firm to touch in center.", "Cool."]
["butter", "cocoa", "water", "buttermilk", "eggs", "sugar", "flour", "baking soda", "vanilla", "peanut butter", "peanut oil", "confectioners sugar"]