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–+ servings
A slice of peanut butter blondie with peanut butter candies on top.
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5 from 29 votes

Peanut Butter Blondies

Peanut Butter Blondies are the ultimate peanut butter treat for the serious peanut butter lovers in your life! Dense and chewy with a layer of creamy peanut butter frosting on top and Reese's Pieces, these are the perfect bar dessert for when you really need that peanut butter fix!
Prep Time10 minutes
Cook Time25 minutes
Total Time35 minutes
Course: Dessert
Cuisine: American
Servings: 9 servings
Author: Amy Nash

Ingredients

Peanut Butter Blondies

  • 1/2 cup creamy peanut butter
  • 1/2 cup salted butter melted
  • 3/4 cup light brown sugar
  • 1 large egg
  • 1 large egg yolk
  • 1 teaspoon vanilla extract
  • 1 cup all-purpose flour
  • 1/4 teaspoon salt

Peanut Butter Frosting

  • 1 cup creamy peanut butter
  • 1/2 cup salted butter softened
  • 1/2 teaspoon vanilla extract
  • 2 Tablespoons heavy cream
  • 1 cup powdered sugar
  • 1/2 cup Reese's Pieces

Instructions

  • Heat oven to 350°F. Line a square 8x8 baking dish with a parchment paper sling.
  • In a large bowl, whisk the peanut butter and butter together until smooth and creamy. Add the brown sugar, egg and extra egg yolk, and vanilla and mix well to combine.
    1/2 cup creamy peanut butter, 1/2 cup salted butter, 3/4 cup light brown sugar, 1 large egg, 1 large egg yolk, 1 teaspoon vanilla extract
  • Stir in the flour and salt with a spoon, then spread into the prepared baking dish, pushing towards the edges of the pan as needed. Sprinkle with Reese's Pieces, if not planning to frost.
    1 cup all-purpose flour, 1/2 cup Reese's Pieces, 1/4 teaspoon salt
  • Bake for 20-25 minutes until done, then remove from oven and cool completely. Do not overbake.
  • Prepare the frosting by beating the peanut butter and butter together until smooth and creamy. Add the vanilla, cream and powdered sugar and beat well, then frost the peanut butter blondies in the pan and sprinkle with Reese's Pieces. Cut into squares and serve.
    1 cup creamy peanut butter, 1/2 cup salted butter, 1/2 teaspoon vanilla extract, 2 Tablespoons heavy cream, 1 cup powdered sugar

Notes

  • Mix-ins: Add 3/4 to 1 cup chocolate chips, peanut butter chips, or white chocolate chips to the batter, if desired.
  • Disneyland peanut butter blondies: You might have seen a version of these at Disney that skips the frosting and instead just spreads a layer of peanut butter on the blondies while they are still warm from the oven. Then the top is generously sprinkled with even more Reese's Pieces than what you see here until it is practically covered.
  • Storage: We recommend storing these peanut butter bars in an airtight container at room temperature for 3-4 days or in the fridge for up to 1 week. Let them come to room temperature before serving if refrigerated.
  • Freezing: They freeze great for up to 1 month. Just slice into squares and freeze in a single layer on parchment paper for 1 hour before transferring to an airtight container for longer freezing.
  • Pan size: A 9x9-inch pan can be used but the bars will be slightly thinner and bake a couple minutes faster. Or you can double the recipe and use a 9x13-inch pan.

Nutrition

Serving: 1g | Calories: 669kcal | Carbohydrates: 55g | Protein: 13g | Fat: 47g | Saturated Fat: 20g | Polyunsaturated Fat: 22g | Trans Fat: 1g | Cholesterol: 99mg | Sodium: 460mg | Fiber: 3g | Sugar: 35g

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