Peanut Butter Sheet Cake

Posted by Vanessa in Cooking, August 16, 2017


The peanut butter and chocolate combination is a weakness for me.  Maybe I shouldn’t say weakness, but I do really enjoy it.  If a restaurant has a chocolate peanut butter milkshake, I’m gonna get one.  When we get frozen custard, I pretty much always get chocolate custard with peanut butter sauce on top.  It’s a flavor combination I particularly adore.

So when I came across this recipe, I wanted to try it, but wasn’t sure the rest of my family would be too excited.  One afternoon I decided I’d make it anyways.  I never would have guessed, but they all, every single one, loved it.  We had it for dessert a couple nights in a row and I know that won’t be the last time.  Give it a try.  This one, it’s a good one.

Peanut Butter Sheet Cake

recipe from Buns in My Oven
  • Prep Time: 20 minutes.
  • Cook Time: 15 minutes.
  • Ready in 35 Minutes.
  • Makes: 24 Servings
  • For the Cake :
  • 1 1/2 cups granulated sugar
  • 1/2 cup brown sugar
  • 2 cups flour
  • 1 teaspoon baking soda
  • 1 teaspoon kosher salt
  • 1 1/2 cups milk, divided
  • 1 cup creamy peanut butter
  • 1 cup butter
  • 2 teaspoons vanilla
  • 2 eggs
  • For the Frosting :
  • 1 cup granulated sugar
  • 1/3 cup butter
  • 1/3 cup milk
  • 1/2 cup creamy peanut butter
  • 1/2 cup semi-sweet chocolate chips
  • Preheat oven to 400 degrees. Grease bottom only of a rimmed half sheet pan.
  • Add both sugars, the flour, baking soda and salt to a large mixing bowl. Using a large whisk, combine well.
  • Add 1 cup of the milk, peanut butter and butter to a small saucepan, and bring to a boil, stirring frequently. While this is cooking, combine remaining 1/2 cup milk, vanilla and eggs in a small bowl.
  • Remove saucepan from the heat and let sit for a few minutes. Add mixture to the bowl with the sugars and flour. Begin mixing, then add egg mixture and whisk until just combined.
  • Spread cake batter into prepared sheet pan and bake for 15 minutes. Cool completely.
  • To make the frosting, mix the sugar, butter and milk in a small saucepan over medium heat. Bring to a boil (increase heat if necessary) and boil for exactly 60 seconds.
  • Remove from the heat and add peanut butter and chocolate chips. Stir well until thoroughly combined and chocolate is completely melted.
  • Pour warm frosting over the cake and spread with a spatula. Frosting will harden as it cools.
  • Serve once frosting is cooled and set.

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