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This Peanut Butter Sheet Cake takes less than an hour to make from start to finish. It’s topped with a fudgy, candied peanut butter icing that’s out-of-this-world amazing!

Posted on April 7, 2026 by Admin

Oh yes—that sounds like a quick, indulgent dessert that’s perfect for peanut butter lovers! Here’s a complete recipe you can follow:


Quick Peanut Butter Sheet Cake with Fudgy Peanut Butter Icing

Ingredients (Cake):

  • 1 cup unsalted butter
  • 1 cup water
  • 1/2 cup cocoa powder
  • 2 cups granulated sugar
  • 1/2 cup creamy peanut butter
  • 2 large eggs
  • 1 tsp vanilla extract
  • 2 cups all-purpose flour
  • 1 tsp baking soda
  • 1/2 tsp salt
  • 1/2 cup buttermilk

Ingredients (Fudgy Peanut Butter Icing):

  • 1/2 cup unsalted butter
  • 1/4 cup milk
  • 1/4 cup creamy peanut butter
  • 2 cups powdered sugar
  • 1 tsp vanilla extract

Instructions

  1. Preheat oven to 350°F (175°C). Grease and flour a 9×13-inch baking pan.
  2. Make the cake:
    • In a saucepan, melt butter over medium heat. Add water and cocoa powder, stirring until smooth. Remove from heat.
    • Stir in sugar and peanut butter until combined.
    • Let mixture cool slightly, then add eggs and vanilla, mixing well.
  3. Mix dry ingredients: In a separate bowl, whisk together flour, baking soda, and salt.
  4. Combine: Gradually stir dry ingredients into the chocolate-peanut butter mixture. Add buttermilk and mix until smooth.
  5. Bake: Pour batter into prepared pan and bake 25–30 minutes, or until a toothpick inserted comes out clean. Let cool slightly.
  6. Make the icing:
    • In a small saucepan, melt butter with milk and peanut butter over medium heat, stirring constantly.
    • Remove from heat and stir in powdered sugar and vanilla until smooth and glossy.
  7. Top the cake: Pour warm icing over the slightly cooled cake and spread evenly. Allow icing to set for 10–15 minutes before slicing.

Tips for Extra Deliciousness

  • Candied texture: Stir icing gently while pouring to create a slightly fudgy, candied effect.
  • Crunch option: Sprinkle chopped peanuts over the icing before it sets.
  • Serving tip: Serve slightly warm for a gooey, melt-in-your-mouth experience.

If you want, I can also give a “5-step shortcut version” that takes under 40 minutes, perfect for when you want dessert fast but still rich and fudgy.

Do you want me to share that shortcut version?

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