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Reese’s Peanut Butter Cookie Cake
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Reese’s Peanut Butter Cookie Cake

This Reese’s peanut butter cookie cake is a soft, chewy, and chocolate-loaded dessert packed with creamy peanut butter flavor and chunks of Reese’s cups. Baked in one pan and topped with rich chocolate buttercream, it’s an easy yet impressive treat that’s perfect for birthdays, parties, or any sweet craving. Simple ingredients and beginner-friendly steps make it a bakery-style dessert you can enjoy at home anytime.
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Prep Time 35 minutes
Cook Time 18 minutes
Cooling Time 2 hours
Total Time 2 hours 53 minutes
Servings: 10
Course: Dessert
Cuisine: American
Ingredients Method Notes

Ingredients
  

Cookie Cake
  • 1½ cups all-purpose flour 195g
  • ¾ tsp baking soda
  • ½ tsp salt
  • ½ cup unsalted butter room temperature (112g)
  • ½ cup peanut butter 140g
  • ½ cup granulated sugar 104g
  • ½ cup light brown sugar packed (112g)
  • 1 large egg
  • 1 tsp vanilla extract
  • ½ cup chopped Reese’s peanut butter cups 80g
  • ¾ cup semi-sweet chocolate chips 127g
Buttercream
  • ½ cup unsalted butter room temperature (112g)
  • 2 cups powdered sugar 260g
  • ¼ cup cocoa powder 29g
  • ½ tsp vanilla extract
  • 1 –2 tbsp heavy whipping cream
  • 4 –5 Reese’s peanut butter cups halved, for topping

Method
 

  1. Preheat oven to 350°F (180°C). Line a 9-inch cake pan with parchment paper.
  2. Whisk flour, baking soda, and salt together.
  3. Cream butter, peanut butter, and both sugars until light and fluffy.
  4. Add egg and vanilla, mix until combined.
  5. Add dry ingredients and mix until just combined.
  6. Fold in Reese’s cups and chocolate chips.
  7. Press dough into pan and bake for 18–22 minutes.
  8. Cool completely in pan.
  9. Beat butter, powdered sugar, cocoa, vanilla, and cream to make buttercream.
  10. Pipe buttercream on top and decorate with Reese’s halves.
  11. Chill slightly, slice, and serve.

Notes

For the best results, make sure not to overbake the cookie cake—remove it when the edges are lightly golden and the center still looks slightly soft, as it will continue to set while cooling. Always use room temperature butter and peanut butter so the dough mixes smoothly and bakes evenly.
Let the cookie cake cool completely before adding the buttercream, otherwise the frosting can melt and lose its shape. For clean, bakery-style slices, chilling the cake for a short time before cutting makes a big difference.
You can also customize it by adding extra chocolate chips or Reese’s pieces on top before baking for a more indulgent finish.