Go Back
+ servings
overhead shot of peanut butter cookie cake
Print Recipe
4.95 from 19 votes


Peanut Butter Cookie Cake is a giant peanut butter cookie with chocolate frosting.
Prep Time20 minutes
Cook Time20 minutes
Total Time40 minutes
Course: Dessert
Cuisine: American
Servings: 12 servings
Calories: 391kcal
Author: Dorothy Kern



  • 1/2 cup 113g unsalted butter, softened
  • 3/4 cup 213g creamy peanut butter
  • 3/4 cup 138g light brown sugar, packed
  • 1/4 cup 50g granulated sugar
  • 1 teaspoon 5ml vanilla extract
  • 1 large egg
  • 1 tablespoon 15ml milk
  • 1/2 teaspoon 3g baking soda
  • 1/4 teaspoon salt
  • 1 3/4 cup 248g all-purpose flour


  • 1/4 cup 56g unsalted butter, melted
  • 1/4 cup 21g unsweetened cocoa
  • 1 1/4 cups 142g powdered sugar
  • 1/4 teaspoon salt
  • 1-2 tablespoons 15-30ml milk
  • Sprinkles optional


  • Preheat oven to 350°F. Line a 9-inch round cake pan with foil and spray with nonstick cooking spray.
  • Place butter and peanut butter in a large bowl. Using a hand or a stand mixer, mix until combined then add both sugars. Cream until smooth. Mix in egg, vanilla, and milk and mix on medium speed until combined.
  • Mix in baking soda and salt, then slowly mix in flour and mix just until the batter is smooth and comes together. Be sure to scrape the sides of the bowl during mixing.
  • Press batter into prepared pan. Use a fork to create criss-cross marks all over the top.
  • Bake for 15-20 minutes or just until golden brown. Cool completely.
  • Make frosting: whisk butter, cocoa, powdered sugar, salt, and 1 tablespoon milk until smooth, adding a bit more milk as needed for consistency. Place frosting immediately in piping bag and frost immediately, top with sprinkles.
  • Store loosely covered for up to 2 days, longer in refrigerator.


Change up the flavors of the recipe: Add 1 cup of chocolate chips or any chopped candy Add 1 cup of chopped peanuts


Serving: 1serving | Calories: 391kcal | Carbohydrates: 48g | Protein: 6g | Fat: 20g | Saturated Fat: 9g | Cholesterol: 44mg | Sodium: 329mg | Potassium: 174mg | Fiber: 2g | Sugar: 31g | Vitamin A: 375IU | Calcium: 32mg | Iron: 1.6mg