Published Jun 19th
Prep 30m Cook 1h Additional - Ready In 1h 30m
Servings 1 - 9x13 inch pan Calories 718.3

If you like chocolate and peanut butter you will love this cake. A chocolate sheet cake is spread with peanut butter, and then topped with chocolate frosting.

Recipe Ingredients

  • 1 cup margarine
  • ¼ cup unsweetened cocoa powder
  • 1 cup water
  • ½ cup buttermilk
  • 2 eggs
  • 2 cups all-purpose flour
  • 2 cups white sugar
  • ½ teaspoon baking soda
  • 1 teaspoon vanilla extract
  • 1 cup peanut butter
  • 1 ½ tablespoons vegetable oil
  • ¼ cup unsweetened cocoa powder
  • ½ cup margarine
  • 6 tablespoons buttermilk
  • 1 teaspoon vanilla extract
  • 3 ½ cups confectioners' sugar

Cooking Directions

  1. 1 Preheat oven to 350 degrees F (175 degrees C). Grease and flour a 9x13 inch pan.
  2. 2 In a saucepan, combine 1 cup margarine, 1/4 cup cocoa, water, eggs, and 1/2 cup buttermilk in a saucepan. Cook, stirring occasionally, until it bubbles. Remove from heat and set aside.
  3. 3 In a large bowl, mix flour, 2 cups sugar and baking soda. Make a well in the center and pour in chocolate mixture. Add vanilla and beat until smooth. Spread batter into prepared pan.
  4. 4 Bake in the preheated oven for 25 to 30 minutes, or until a toothpick inserted into the center of the cake comes out clean. Allow to cool.
  5. 5 In a small bowl, mix peanut butter and oil. Spread over top of cake. In a saucepan, combine 1/4 cup cocoa, 1/2 cup margarine, and 6 tablespoons buttermilk. Heat until boiling. Remove from heat and stir in vanilla. Place confectioners' sugar in a large bowl. Beat in chocolate mixture and continue mixing until smooth. Spread over cake.

Nutrition Facts

  • Calories 718.3
  • Carbohydrate 93.1 g
  • Cholesterol 31.7 mg
  • Fat 36.7 g
  • Fiber 3 g
  • Protein 10.1 g
  • Saturated Fat 7.1 g
  • Sodium 445.9 mg
  • Sugar 72.5 g


  1. very good cake. Yes I am a peanut butter and choc. lover...but this cake is 100% awesome!!
  2. I made this cake for my husband's birthday & it was a hit. He is a huge peanut butter & chocolate fan & difficult to please but received rave reviews. I'll make this one again. Thanks for sharing the recipe.
  3. If I could give this recipe six stars i would. I made this cake for my finance's birthday and he loved it! The cake was sooo moist and the frosting was absolutely delicious. I did take the advice of adding the eggs after the hot ingredients are added to dry. I used crunchy peanut butter - Read more ...
  4. Excellent recipe. Light and fluffy cake with a nice thick topping. Very rich tasting (have a lot of milk on hand for your guests to drink). I constantly stirred the contents of the saucepan until everything came to a boil (to avoid cooking the eggs as another Reviewer had that problem) and it worked out - Read more ...
  5. This is superb however I have "cheated" and used box cake mix and even box brownies then made the peanut butter & chocolate toppings as directed. Everyone always loves it.
  6. I think it may be a better idea to add the eggs after the hot wet ingredients are added to the dry ingredients because heating the eggs caused them to cook a little.
  7. Although I think this cake and frosting were great it was a bit rich. I was hesitant to add oil to the peanut butter and in hindsight I don't think it was needed at all (in fact it really didn't even need the peanut butter to be delicious!) I would make again but definately would - Read more ...
  8. It smelt good and looked good before I put it into the oven. It didn't turn out at all it was hard and thick and didn't puff up I followed your instructions exactly and would like to know how everyone else succeded! Very disappointed:(
  9. This is the best cake i have EVER eaten! Very wonderful! A must recipe for any peanut butter lover!