Peanut Butter Swirl Brownies Recipe

Kelsey Banfield | The Naptime Chef

Peanut Butter Swirl Brownies are a sweet way to surprise the family. Who doesn't love chocolate and peanut butter in one crazy good brownie?

When tasked with baking a dessert I know both kids and adults will love I always turn to peanut butter swirl brownies. They are one of those desserts that are always an insta-hit with everyone.

Part of the reason is because they are reminiscent of everyone’s (or at least my) favorite candy. (Who doesn’t want to be reminded of a childhood favorite?!) But they are a little more sophisticated and have the texture of a thick, moist chocolate cake.

Peanut Butter Swirl Brownies Photo

Many people have told me that they don’t see the point in baking brownies from scratch, that the box mix tastes just as good. But I beg to differ. I once used to believe the same thing - until I realized that a fresh batch of brownies easily comes together in one bowl!

Plus, the only equipment you need is a microwave or the stovetop to melt the butter and chocolate.

Peanut Butter Swirl Brownies Picture

In this case you need to use an additional bowl for the peanut butter mixture, but, still, that leaves you with two bowls and one spoon to clean. Not bad for a baking project if you ask me.

The key to these brownies is not to overwork the batter. There is a small amount of flour in them, and the more you stir it, the more gluten will form, making for a tougher brownie.

Fold the flour in ever so slightly until just smooth and leave it at that. It may look a little thin when poured in the pan, but I promise it will fluff up!

The peanut butter swirl requires the same light touch. Dollop, swirl once or twice, and put it in the oven.

They bake slowly and evenly and after the agonizing 45 minute wait, you have a gorgeous pan of chocolate peanut butter brownies.

Peanut Butter Swirl Brownies Image

The fun part is, of course, serving them. My kids normally like the bars as they are, grab-and-go style, to be eaten in the hut on top of the swing set. For the adults, however, I am all about fancying them up.

A big scoop of ice cream, chocolate sauce, maybe even peanut butter or chocolate sauce (or both!), and whipped cream. A fancy brownie sundae to take this simple dessert to a whole new level.

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Peanut Butter Swirl Brownies Recipe

    9 Servings


  • 1 stick Unsalted Butter, cut into four pieces
  • 6 ounces Semisweet Baking Chocolate, finely chopped (do not use chocolate chips)
  • 1/2 cup Granulated Sugar
  • 3 large Eggs
  • 1 teaspoon Pure Vanilla Extract
  • 3/4 cup All-Purpose Flour, unbleached
  • 1/2 teaspoon Baking Powder
  • 1/2 teaspoon Kosher Salt
For the Filling:
  • 3 tablespoons Unsalted Butter, melted and cooled
  • 1/4 cup Granulated Sugar
  • 2/3 cup Creamy Peanut Butter, stick with store-brands, natural peanut butter might separate and ruin the topping
  • 1/2 teaspoon Kosher Salt
  • 1 teaspoon Pure Vanilla Extract


  1. Heat the oven to 325°F. Spray the bottom and sides of an 8x8 glass baking dish and set aside.
  2. Put the butter the chocolate in a large microwave-proof bowl and heat in 30-second bursts until the butter and chocolate have melted and can be stirred together until smooth. Working quickly, whisk in the sugar until the batter is smooth, then whisk in the eggs, and vanilla.
  3. Combine the flour, baking powder, and salt in a small bowl and fold it into the brownie batter. Stir it until the flour is just incorporated and the batter is smooth. Then stop stirring so the batter does not get overworked.
  4. Make the peanut butter filling by combine all of the filling ingredients in one bowl and stirring it until smooth and creamy.
  5. Use a tablespoon to dollop the peanut butter mixture randomly top of the brownie in even amounts. Then, use a dull knife to swirl the peanut butter into the batter, running the knife horizontally through the peanut butter once or twice. Do not over-swirl the peanut butter or it will get too blended into the batter and disappear.
  6. Bake the brownies for 40 to 45 minutes, or until a cake tester insert into the center comes out clean. Allow the brownies to cool completely in the pan, then cut into squares to serve.


Cooking Method:
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Related Recipes:
Baking Recipes, Baked Recipes, Brownie Recipes, Dessert Recipes, Bar Dessert Recipes, Chocolate Recipes, Peanut Butter Recipes, Easy Recipes, Family Meals and Snack Recipes, Snack Recipes
Recipe Yields:
9 large brownies
Prep Time:
Cook Time:
Total Time:
Related Post:
Author: Kelsey Banfield
Recipe Yields: 9 large brownies
Prep Time: 10 minutes
Cook Time: 45 minutes
Total Time: 55 minutes

Nutrition Facts

Serving Size 1 brownie
Servings Per Recipe 9

Amount Per Serving
Calories from Fat 278
Calories 459

% Daily Value*
Total Fat 35g
  Saturated Fat 17g
Sodium 150mg
Total Carbohydrate 34g
  Dietary Fiber 4g
  Sugars 18g
Protein 10g

* Percent Daily Value are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
** Nutrition Facts are estimated based on ingredients and data provided by Fat Secret. Please consult a doctor if you have special dietary needs.
Kelsey Banfield

About Kelsey

Kelsey Banfield is The Naptime Chef. Just because kids come along doesn't mean you have to give up great food. As one of our Baking Fanatic, she'll be showing you all the great things you can whip up during naptime!

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