Chocolate Sheet Cake with Peanut Butter Frosting

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I started making this Chocolate Sheet Cake recipe when I was in high school. It always came in handy when I needed a dessert to take to school sports banquets or when my friends were coming over. It has been one of my “go to” cakes for years. I usually make a chocolate frosting, but I recently switched things up and made a creamy peanut butter frosting to top the cake.  Best decision ever! This Chocolate Sheet Cake with Peanut Butter Frosting is my new favorite cake.

I made this cake because we were having friends over for dessert. It is the perfect cake for entertaining and sharing. It is so easy to make-you probably have all of the ingredients in your kitchen right now. Hint, hint-as soon as you finish reading this post, you better get baking:) The cake is rich, chocolaty, and incredibly moist. Everything you’ve dreamed about in a chocolate cake.

The peanut butter frosting really is the icing on the cake:) I like to frost the cake when it is still warm so the frosting spreads easily and melts over the chocolate cake. I also like to chop up Reese’s Peanut Butter Cups and sprinkle them generously over the peanut butter frosting. The candy adds decoration with almost no effort and ties the chocolate cake and peanut butter frosting together.

Our friends loved this Chocolate Sheet Cake with Peanut Butter Frosting. I sent pieces of cake home with them, but we still had some cake leftover. It is a big cake! I was forced to eat the rest of the cake all by myself since Josh is allergic to peanut butter. Every time I walked by the sheet pan I had to have a bite. I couldn’t let the cake go to waste. Sometimes it is rough taking one for the team:)

Make this Chocolate Sheet Cake with Peanut Butter Frosting…and be prepared to share! It feeds a crowd! Or you can just let the cake sit on the counter and it will magically disappear. I bet you can’t walk by without taking a bite, or two, or a gigantic piece. It is so good!

Chocolate Sheet Cake with Peanut Butter Frosting

Rich chocolate sheet cake with peanut butter frosting. This easy and decadent cake will feed a crowd.
Prep Time
20 minutes
Cook Time
18 minutes

Ingredients

For the Chocolate Sheet Cake:

  • 2 cups granulated sugar
  • 2 cups all-purpose flour
  • 1 teaspoon baking soda
  • 1/2 teaspoon salt
  • 2 large eggs lightly beaten
  • 1/2 cup buttermilk
  • 1 teaspoon pure vanilla extract
  • 1 cup unsalted butter
  • 1/4 cup cocoa powder
  • 1 cup hot water

For the Peanut Butter Frosting:

  • 3 cups sifted powdered sugar
  • 1/2 cup milk
  • 1/2 cup creamy peanut butter
  • 1 teaspoon vanilla extract
  • Reese's Peanut Butter Cups chopped-optional

Instructions

  1. To make the sheet cake: Preheat oven to 350 degrees. Grease a sheet pan with cooking spray and set aside. I use an 11 x 17 jelly roll pan.
  2. In a large mixing bowl, whisk together sugar, flour, baking soda, and salt. In a separate bowl, whisk together eggs, buttermilk, and vanilla extract. Set aside.
  3. In a small sauce pan, melt the butter on medium-low heat. Whisk in the cocoa powder and hot water. Turn up the heat to medium-high and bring the mixture to a boil. Add the melted butter mixture to the dry ingredients and mix until smooth. Stir in the egg mixture and mix until ingredients are combined.
  4. Pour the batter into the prepared sheet pan and tap on the counter a few times to distribute the cake batter evenly. Bake the cake for 18 minutes, or until a toothpick comes out clean when inserted in the center.
  5. While the cake is baking, make the peanut butter frosting. In the bowl of a stand mixer, combine the sifted powdered sugar, milk, peanut butter, and vanilla extract. Beat with the beater blade until smooth. Frost the chocolate sheet cake after the cake has cooled. Sprinkle chopped up Reese's Peanut Butter Cups over the frosting, if desired. Let the frosted cake cool to room temperature. Cut into squares and serve.

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Maria Lichty

I’m Maria and my husband is Josh. We share a love of cooking, baking, and entertaining. We enjoy creating recipes that are simple, fresh, and family friendly. We love sitting around the table with good food, good conversation, and good friends and family! Our kitchen is always open!
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CommentsLeave a reply

  1. I made this exactly as you wrote… IT WAS AMAZINGLY GOOD! Thank you for sharing it! It took me all day though, but worth it. I had featured u in the post of Here Are Seven New Ways To Make Romantic Chocolate Cakes For Fathers on AllFreshRecipes.Except ur more Eats!

  2. This looks so yummy! I may make this for my husband for Father’s Day. What do you do with your leftover buttermilk? I don’t use it on a regular basis, so it’s tough to justify needing only half a cup and not using the rest of the container. Thanks!

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