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These peanut butter blondies are soft, chewy, and absolutely bursting with peanut butter flavor!  These blondies are made completely from scratch with a few key ingredients to maximize their soft texture! 

Peanut Butter Blondies stacked on a plate. One with a bite taken out of it

Hello again! Sam here from Sugar Spun Run with yet another sweet treat to share!

Today I want to share these incredibly soft and chewy peanut butter blondies.  I love peanut butter, and after developing what I consider to be the very best and softest peanut butter cookie (which I used as the base for my peanut butter blossoms), I knew that I wanted a peanut butter blondie recipe that was equally soft and chewy and bursting with peanut butter flavor.

These blondies are it.

Blondies cut into squares

The addition of an extra egg yolk, a heavy handed pouring of brown sugar, and a teaspoon of cornstarch all help to make these peanut butter blondies extra soft.  We’re also going to use a full cup of peanut butter in this recipe for the best possible flavor.

I use creamy peanut butter for this recipe, and while I think that crunchy peanut butter would work fine, I do not recommend using a natural peanut butter (the kind that you need to stir) as I’m not sure that it would turn out quite as well.  You can, however, feel free to get creative with in other add-ins such as chocolate chips or toffee bits for a little bit of added texture!

You’ll bake these peanut butter blondies in a 13×9 pan, and while you may lightly grease and flour the pan, I recommend lining the pan with parchment paper but using enough that the paper hangs over the shorter sides of the pan.  Once the blondies bake and cool completely you’ll be able to simply lift them out of the pan to easily cut them — and it makes for easy cleanup, too!

The parchment paper is a little wiggly so it’s a little trickier to spread the thick peanut butter blondie batter into the pan, but I always do it because it makes everything much easier in the long run.


Peanut Butter Blondies

24 Servings

Peanut Butter Blondies stacked on a plate. One with a bite taken out of it
Soft and chewy peanut butter blondies!
  • 1 cup unsalted butter softened
  • 1 cup creamy peanut butter I don't recommend using natural peanut butter
  • 1 cup light or dark brown sugar tightly packed
  • 1 cup granulated sugar
  • 1 large egg + 1 large egg yolk
  • 2 teaspoons vanilla extract
  • 2 3/4 cups all-purpose flour
  • 1 teaspoon cornstarch
  • 1 teaspoon baking powder
  • 1/4 teaspoon salt
  • 2 Tablespoons milk
  • Preheat your oven to 350F and line a 13x9 pan with parchment paper, using enough paper that it hangs over the sides of the pan (so that you can easily lift the bars out of the pan once they have cooled).
  • In the bowl of a stand mixer or in a large bowl using an electric hand mixer, cream together butter, peanut butter, and sugars until well-combined.
  • Add eggs, egg yolk, and vanilla extract, stirring until combined.
  • In a separate medium-sized bowl, whisk together flour, cornstarch, baking powder, and salt.
  • Gradually stir dry ingredients into wet until completely combined.
  • Add milk and stir well.
  • Spread batter evenly into prepared pan and bake on 350F for 25-28 minutes (toothpick inserted in the center of the bars should come out dry or with a few moist crumbs).
  • Allow to cool before slicing and serving.


Calories: 254kcal | Carbohydrates: 30g | Protein: 4g | Fat: 13g | Saturated Fat: 6g | Cholesterol: 28mg | Sodium: 78mg | Potassium: 118mg | Fiber: 1g | Sugar: 18g | Vitamin A: 245IU | Calcium: 26mg | Iron: 1mg
Course: Dessert
Cuisine: American
Keyword: Peanut Butter Blondies
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