I recently made this Peanut Butter Sheet Cake to take to a family reunion over Memorial Day weekend. It was very well received and several people asked for the recipe. It’s a great recipe for when you want to make dessert for a crowd.
In a saucepan, bring water, oil, butter, and peanut butter to a boil.
Meanwhile, mix together flour, sugar, baking soda, and salt in a large mixing bowl.
After the butter mixture comes to a boil, pour over the dry ingredients and mix well. The batter will be thick, but it should not be lumpy.
Once combined, add the eggs, buttermilk, and vanilla. Mix it really well. You could use a mixer here, but a few minutes of stirring by hand will do the trick. The batter will be really smooth.
Pour into the prepared pan, and bake.
While cake is baking, make the frosting. You will need 1 pound of powdered sugar, which is about 4 cups.
Bring the frosting ingredients (except powdered sugar) to a boil on the stove top.
Pour over powdered sugar and beat until smooth.
Add some extra milk a tablespoon at a time if the frosting is a little too thick.
Pour on warm cake and spread until smooth.
Let the cake cool, then slice and serve!
Peanut Butter Sheet Cake
Ingredients
Cake
- 1 cup water
- 1/2 cup oil
- 3/4 cup butter
- 1/2 cup peanut butter
- 2 cups flour
- 2 cups sugar
- 1 teaspoon baking soda
- 1/2 teaspoon salt
- 2 eggs
- 1/2 cup buttermilk
- 1 teaspoon vanilla
Frosting
- 1 pound powdered sugar about 4 cups
- 1/2 cup peanut butter
- 1/2 cup butter
- 1/3 cup milk
Instructions
- Grease and flour a 12"x18" sheet cake pan, and preheat oven to 350 degrees F.
- In a saucepan, bring the water, oil, butter, and peanut butter to a boil.
- Meanwhile, mix together flour, sugar, baking soda, and salt in a large mixing bowl. After the butter mixture comes to a boil, pour over dry ingredients and mix well. Once combined, add eggs, buttermilk, and vanilla. Mix well.
- Pour in prepared pan, and bake at 350 for 15 to 18 minutes.
- While cake is baking, prepare the frosting. Bring the frosting ingredients (except powdered sugar) to a boil on the stove top. Pour over powdered sugar and beat until smooth. Add extra milk a tablespoon at a time if the frosting is too thick. Pour on warm cake and spread until smooth. Let the cake cool, then slice and serve.
Recipe adapted from a Middle School Cookbook
June 2, 2012 at 6:39 pmThis looks so good! When I was I kid I used to eat these peanut butter cake bars at school and I’ve been trying to recreate the recipe ever since. This looks pretty darn close. Can’t wait to try it!
June 4, 2012 at 2:41 pmMy husband loves peanut butter. I may have to make this for our Father’s Day get together with family. It looks so yummy!
November 3, 2012 at 4:48 pm“bring the frosting ingredient to boil” , does that include milk? as i was kind of confuse when you say “Add milk a tablespoon at a time if needed”, does that mean EXTRA milk? or from the 1/3 cup of milk?
THANKS!
November 4, 2012 at 6:58 amYes, the frosting ingredients includes the milk. The milk added a tablespoon at a time is extra, in case the frosting is too thick. I hope that helps!