Peanut Butter Sheet Cake

Peanut Butter Sheet Cake

24 servings
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! Recipe includes a how-to video!

Ingredients

  • 2 cups all-purpose flour
  • 1 cup granulated sugar
  • ¾ cups light brown sugar

    firmly packed

  • ¾ teaspoon baking soda
  • ¾ teaspoon salt
  • 1 cup water
  • ¾ cup unsalted butter

    cut into pieces

  • ¼ cup canola or vegetable oil
  • ½ cup creamy peanut butter
  • ½ cup buttermilk
  • 2 large eggs

    room temperature preferred

  • 1 ½ teaspoons vanilla extract
  • 4 cups powdered sugar
  • ½ cup buttermilk
  • 10 Tablespoons unsalted butter

    cut into pieces

  • ⅔ cup creamy peanut butter
  • ¼ heaping teaspoon salt
  • 1 teaspoon vanilla extract

Directions

  1. 1

    Preheat oven to 350F (175C) and lightly grease a 13x9 baking pan. Set aside.

  2. 2

    In a large bowl, whisk together flour, sugars, baking soda, and salt.

  3. 3

    In a medium-sized saucepan, combine water, butter, and oil. Heat over medium heat, stirring occasionally until butter is melted and bring to a boil.

  4. 4

    Once boiling, remove from heat and add peanut butter. Stir until peanut butter is dissolved and mixture is smooth. Add to bowl with dry ingredients and stir until combined. Set aside to cool for 5-10 minutes.

  5. 5

    Meanwhile, in a separate bowl, whisk together buttermilk, eggs, and vanilla extract.

  6. 6

    Gradually stir buttermilk mixture into batter, stirring until just combined.

  7. 7

    Pour batter evenly into prepared pan and transfer to center rack of 350F (175C) preheated oven and bake for 30-32 minutes or until a toothpick inserted in the center comes out clean or with moist crumbs. Prepare frosting.

  8. 8

    Measure out sugar and set aside (if you’re worried about lumps in your icing, sift the sugar after measuring).

Peanut Butter Sheet Cake

Peanut Butter Sheet Cake

57 min24 servings

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About this Recipe

Craving a dessert that's both comforting and impressive, but without spending hours in the kitchen? This Peanut Butter Sheet Cake is your answer, delivering an incredible homemade taste in less than an hour from start to finish.

What truly sets this recipe apart is its ingenious design: a rich, tender cake base is quickly prepared, then blanketed in an out-of-this-world fudgy, candied peanut butter icing. The combination of cake and icing creates a perfect balance of textures and intense peanut butter flavor that will have everyone asking for seconds.

Prepare for a truly satisfying peanut butter experience. The cake itself is wonderfully moist, with a delicate crumb that complements the dense, almost candy-like topping. Each bite offers a harmonious blend of sweet and savory notes from the double dose of creamy peanut butter, while the fudgy icing provides a luxurious, melt-in-your-mouth finish. This generously sized cake is surprisingly straightforward to make, proving that crowd-pleasing desserts don't have to be complicated.

While this cake is perfect as is, you can easily make it your own. For a different texture, try swapping out a portion of the creamy peanut butter in the cake batter for crunchy peanut butter. If you prefer a less intense sweetness in the cake, you could slightly reduce the granulated sugar. You could also experiment with a dark brown sugar for a richer, more molasses-like flavor in the cake.

This generously portioned sheet cake is ideal for potlucks, family gatherings, or any occasion where you need to feed a crowd with a show-stopping dessert. Serve it simply, or with a sprinkle of chopped roasted peanuts for an extra textural flourish.

Frequently Asked Questions