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5.0 from 87 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 Time
10 mins
Cook Time
10 mins
Total Time
35 mins
Servings: 9 servings
Calories: 669 kcal
Course: Dessert
Cuisine: American

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

    Cup of Yum
  1. Heat oven to 350°F. Line a square 8x8 baking dish with a parchment paper sling.
  2. 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.
  3. 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.
  4. Bake for 20-25 minutes until done, then remove from oven and cool completely. Do not overbake.
  5. 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.

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 Information

Serving 1g Calories 669kcal (33%) Carbohydrates 55g (18%) Protein 13g (26%) Fat 47g (72%) Saturated Fat 20g (100%) Polyunsaturated Fat 22g Trans Fat 1g Cholesterol 99mg (33%) Sodium 460mg (19%) Fiber 3g (12%) Sugar 35g (70%)

Nutrition Facts

Serving: 9servings

Amount Per Serving

Calories 669

% Daily Value*

Serving 1g
Calories 669kcal 33%
Carbohydrates 55g 18%
Protein 13g 26%
Fat 47g 72%
Saturated Fat 20g 100%
Polyunsaturated Fat 22g 129%
Trans Fat 1g 50%
Cholesterol 99mg 33%
Sodium 460mg 19%
Fiber 3g 12%
Sugar 35g 70%

* Percent Daily Values are based on a 2,000 calorie diet.