Peanut Butter Chocolate Swirl Brownies

Featured in: Baking

These brownies combine the classic flavors of chocolate and peanut butter in a deliciously fudgy treat. Freshly melted butter, cocoa, and vanilla come together to create a luscious batter. Creamy peanut butter is swirled throughout, giving pockets of nutty flavor in each bite. Perfectly baked until just set, these brownies offer a rich texture—soft in the middle with a delicate crust. Enhance with crunchy chopped peanuts on top for extra texture. Ideal for dessert or a sweet snack whenever you crave a decadent twist on a classic favorite.

Updated on Wed, 30 Jul 2025 10:36:33 GMT
A tray of peanut butter chocolate swirl brownies. Save to Pinterest
A tray of peanut butter chocolate swirl brownies. | buddybiteskitchen.com

These peanut butter chocolate swirl brownies blend deep chocolate with ribbons of creamy peanut butter for a treat guaranteed to satisfy any craving. Whether you need a bake sale hit or just want something sweet for movie night these brownies never disappoint with their beautiful marbled top and fudgy center.

I first made these brownies for my partner’s birthday and now they are a family tradition every year. The peanut butter swirl makes each piece feel extra special.

Ingredients

  • Unsalted butter: for fudgy texture and richness always use a good quality butter for best flavor
  • Sugar: creates the perfect crackly top look for granulated sugar that pours freely
  • Large eggs: give structure and a chewy texture choose fresh eggs for fluffier brownies
  • Vanilla extract: adds smooth warmth pure vanilla is worth the splurge
  • Cocoa powder: brings deep chocolate flavor Dutch processed if you like darker color
  • All purpose flour: binds everything together measure carefully to avoid cakey brownies
  • Salt: enhances chocolate taste go for fine grain to distribute evenly
  • Baking powder: provides a little lift
  • Creamy peanut butter: makes that beautiful swirl natural style spreads better if slightly warmed

Instructions

Preheat and Prepare the Pan:
Set your oven to three hundred fifty degrees Fahrenheit and grease a square baking pan thoroughly so nothing sticks after baking
Mix Wet Ingredients:
In a mixing bowl combine melted butter and sugar stir until smooth and glossy then beat in eggs one at a time followed by vanilla extract mixing well after each addition to ensure the top forms a pretty crackly finish
Add Dry Ingredients:
Sift in the cocoa powder flour salt and baking powder over the wet mixture fold gently until just combined do not over mix or the brownies will be tough
Layer and Swirl:
Pour half the chocolate batter into the prepared pan smooth into all corners Dollop spoonfuls of peanut butter evenly over the surface Top with the remaining brownie batter and smooth very gently
Create the Swirl:
With a small knife or toothpick drag through the peanut butter and chocolate in figure eight motions swirling the two together Do not over swirl for clear marbling
Bake:
Place in the center of the oven and bake for twenty five to thirty minutes the edges should look set and the center still a little soft Cool completely before slicing to set the fudgy texture
A close up of a delicious peanut butter chocolate swirl brownie. Save to Pinterest
A close up of a delicious peanut butter chocolate swirl brownie. | buddybiteskitchen.com

When I swirl the peanut butter my kids love sneaking a taste off the knife it reminds me of baking with my mom and getting the first gooey corner piece

Storage Tips

Store these brownies in an airtight container at room temperature for up to three days For longer storage freeze individual slices wrapped tightly in plastic and foil then thaw at room temperature Brownies stay tender and will not dry out

Ingredient Substitutions

You can use dark chocolate cocoa for a more intense flavor Almond butter also works for a twist on the classic peanut chocolate combo If you want a gluten free version a cup for cup blend will do the trick

Serving Suggestions

Serve warmed slightly with a scoop of vanilla ice cream or a glass of cold milk Chopped toasted peanuts on top before baking add crunch and an extra peanut flavor

Cultural and Historical Context

Brownies are a true American classic and were first popular in early twentieth century cookbooks Adding peanut butter marries two beloved flavors making this recipe a nostalgic favorite

Seasonal Adaptations

Peanut butter is available year round if you want to make these brownies seasonally add fall spices like cinnamon at Thanksgiving or swirl in raspberry jam in summer months

A tray of peanut butter chocolate swirl brownies. Save to Pinterest
A tray of peanut butter chocolate swirl brownies. | buddybiteskitchen.com

Bake a batch of these brownies and you will see them disappear in no time. Every slice is delightfully gooey with the perfect chocolate and peanut butter balance.

Common Recipe Questions

How do I achieve the perfect swirl in the brownies?

After adding the peanut butter to the batter, use a knife to gently swirl it into the chocolate. Be careful not to overmix for distinct marbled effects.

Can I use crunchy peanut butter instead of creamy?

Yes, crunchy peanut butter works well and adds extra texture and nutty bits to your brownies.

What’s the best way to store these brownies?

Once cooled, store them in an airtight container at room temperature for up to 3 days, or refrigerate for longer freshness.

How do I know when the brownies are done?

Bake until the edges are set and a toothpick inserted in the center comes out with a few moist crumbs.

Can I add toppings for extra crunch?

Yes, sprinkle chopped peanuts or chocolate chips on top before baking to enhance texture and flavor.

Peanut Butter Chocolate Swirl Brownies

Fudgy chocolate brownies swirled with creamy peanut butter for irresistible taste and texture.

Prep Time
10 minutes
Cook Time
30 minutes
Total Time
40 minutes
Created By Max Buddyfield

Recipe Category Baking

Skill Level Easy

Cuisine Type American

Recipe Yield 12 Number of Servings

Dietary Preferences Suitable for Vegetarians

What You'll Need

Brownie Base

01 1/2 cup unsalted butter, melted
02 1 cup granulated sugar
03 2 large eggs
04 1 teaspoon vanilla extract
05 1/3 cup unsweetened cocoa powder
06 1/2 cup all-purpose flour
07 1/4 teaspoon salt
08 1/4 teaspoon baking powder

Swirl

01 1/2 cup creamy peanut butter

Steps to Follow

Step 01

Prepare Oven and Pan: Preheat the oven to 350°F (175°C) and grease a square baking pan.

Step 02

Combine Wet Ingredients: In a large bowl, whisk together melted unsalted butter, granulated sugar, eggs, and vanilla extract until smooth.

Step 03

Incorporate Dry Ingredients: Stir in cocoa powder, all-purpose flour, salt, and baking powder until just combined; do not overmix.

Step 04

Layer and Swirl Batter: Pour half of the batter into the prepared pan. Drop spoonfuls of creamy peanut butter over the batter, then spread the remaining batter on top. Use a knife to gently swirl the peanut butter through the batter to create a marbled effect.

Step 05

Bake Brownies: Bake for 25–30 minutes or until the brownies are set and a toothpick inserted in the center comes out with a few moist crumbs.

Step 06

Cool and Serve: Allow brownies to cool in the pan before slicing and serving.

Tools You'll Need

  • 9-inch square baking pan
  • Mixing bowls
  • Whisk
  • Spatula
  • Knife

Allergy Warnings

Review each ingredient carefully for allergens. If unsure, consult with a healthcare provider.
  • Contains peanuts, eggs, dairy, and wheat.

Nutritional Info (per serving)

These details are for general information only. Always consult a healthcare professional for dietary concerns.
  • Calorie Count: 240
  • Fat Content: 13 grams
  • Carbohydrates: 27 grams
  • Protein Content: 5 grams