Steps:
- Preheat oven to 375 degrees. For the cake: In a medium pot add the peanut butter, water, and butter and bring to a boil. Remove from heat. In a separate bowl, mix together the sugar, brown sugar, flour, salt, and baking soda with a fork. Add to the peanut butter mixture. Add the eggs, buttermilk, and vanilla to the bowl and mix well. Stir well and pour into greased or parchment lined cookie sheet pan with a little edge (12X17 jellyroll pan). Bake for 15 minutes at 375 degrees. For the Frosting: In a small pot bring the butter, buttermilk, and peanut butter to a boil. Remove pan from the heat and add the powdered sugar and vanilla. Pour frosting over the warm cake. *Notes Michelle H. says if you do not have a jelly roll pan, you can bake it in a deeper cake pan but have to leave it in the oven a little longer but I suggest buying a jelly roll pan. It's worth it and not too expensive at Walmart. It tastes a lot like peanut butter fudge with the frosting. Enjoy!
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