Grammy's Peanut Butter Sheet Cake

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READY IN: 40mins
Recipe by mlhuston

A very moist peanut butter sheet cake that my whole family loves! I have also used whole wheat flour in it and it turned out just as good.

Ingredients Nutrition


  1. Preheat oven to 350.
  2. Mix together flour, sugar, and soda. Set aside.
  3. In a saucepan, bring butter, peanut butter, and water to a boil.
  4. Pour directly into dry ingredients and mix.
  5. Add eggs, vanilla, and buttermilk, blending well.
  6. Pour into a greased and floured 11x15x1 inch sheet cake pan.
  7. Bake 15 - 18 minutes or till light brown on top.
  8. While cake bakes, combine milk, sugar and butter in saucepan for icing.
  9. Bring to a boil and remove from the heat.
  10. Add peanut butter and marshmallows. Stir until melted.
  11. Add powdered sugar to make a spreading consistency.
  12. Can add 1 t. of vanilla if desired.
  13. Cool cake slightly and pour on icing while cake is still warm. Spread with an offset spatula.

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