Get ready to meet your new favorite sweet treat: Peanut Butter Brownie Swirl Cookies! Imagine the perfect marriage of fudgy brownies and melt-in-your-mouth peanut butter cookies, beautifully marbled into bite-sized rounds of pure joy. Each bite is a delightful swirl of chocolate and peanut butter, soft in the center with perfectly crisp edges. These cookies bring the best of both worlds, with an irresistible visual appeal and a flavor combination that’s hard to beat!

Ingredients You’ll Need
It’s amazing how a handful of pantry staples can create something so utterly scrumptious. With just a few key ingredients, each chosen for its unique contribution, you’ll whip up Peanut Butter Brownie Swirl Cookies that look fancy but couldn’t be simpler to make!
- Unsalted butter: Softened to add richness and create that irresistible chewy texture.
- Creamy peanut butter: The star player bringing bold, nutty flavor and moistness to every bite.
- Granulated sugar: Adds the perfect amount of sweetness and helps with spread.
- Brown sugar: For deep, caramel notes and extra chewiness.
- Large egg: Binds the dough together and makes cookies tender.
- Vanilla extract: Rounds out flavors with warm, aromatic undertones.
- All-purpose flour: The backbone of your cookie, providing structure.
- Baking soda: Ensures lift and beautiful texture.
- Salt: Just a pinch to balance all the sweetness.
- Brownie mix (dry): Brings that chocolatey, fudgy goodness for the swirl!
- Milk (as needed): Just a touch to help blend the brownie dough, if necessary.
How to Make Peanut Butter Brownie Swirl Cookies
Step 1: Prep Your Oven and Pans
Start by preheating your oven to 350°F (175°C) and lining your baking sheets with parchment paper. This step is essential so your Peanut Butter Brownie Swirl Cookies come off the pan without sticking or losing their gorgeous marbled bottoms.
Step 2: Cream the Wet Ingredients
In a large mixing bowl, combine the softened butter, creamy peanut butter, granulated sugar, and brown sugar. Cream these together until the mixture turns light and fluffy—this usually takes about 2-3 minutes. It’s the secret to a cookie base that’s both rich and tender.
Step 3: Add Egg and Vanilla
Beat in the large egg and vanilla extract until everything is silky and well incorporated. Don’t rush this step—it ensures your dough is smooth and flavorful from top to bottom.
Step 4: Whisk Dry Ingredients Separately
In a medium bowl, gently whisk together the all-purpose flour, baking soda, and salt. This guarantees the leavening agent and salt are evenly distributed, helping every cookie bake perfectly.
Step 5: Combine Wet and Dry Mixtures
Gradually add your dry mixture into the wet ingredients, stirring just until a soft dough forms. Be careful not to overmix; you want your Peanut Butter Brownie Swirl Cookies to stay tender.
Step 6: Create the Swirls
Divide the dough in half. Into one half, mix the dry brownie mix—if it feels dry or crumbly, add up to 1 tablespoon milk to help it come together. Now, pinch off small amounts of each dough. Gently press and swirl them together by hand, rolling into 1.5-inch dough balls. This is where the magic marble effect happens, so keep it light—overmixing loses the pretty swirl!
Step 7: Shape and Bake
Place each dough ball onto your prepared baking sheets, giving them about 2 inches of space. Bake for 10–12 minutes. You’ll know they’re done when the edges are set and the centers are just slightly soft—they’ll continue to set as they cool, resulting in ultimate chewy perfection.
Step 8: Cool and Enjoy
Let the cookies rest on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely. This helps keep their beautiful swirl intact and ensures every bite is just the right texture.
How to Serve Peanut Butter Brownie Swirl Cookies

Garnishes
A simple sprinkle of flaky sea salt right after baking takes these Peanut Butter Brownie Swirl Cookies to the next level, intensifying those sweet and salty flavors. For extra flair, a light dusting of powdered sugar or even a drizzle of melted chocolate makes them absolutely irresistible.
Side Dishes
These cookies shine beside a tall glass of icy-cold milk or a hot cup of coffee. You could even plate them alongside fresh berries or a scoop of vanilla ice cream for a truly decadent dessert spread—pure bliss!
Creative Ways to Present
Stack your Peanut Butter Brownie Swirl Cookies in a clear jar for a show-stopping gift, or pile them high on a tiered cake stand for parties. For a playful touch, tuck them partially into parchment bags and tie with twine for an on-the-go treat that everyone will rave about.
Make Ahead and Storage
Storing Leftovers
Once cooled, stash your Peanut Butter Brownie Swirl Cookies in an airtight container at room temperature. They’ll stay fresh for up to five days (if you can resist that long!). A slice of sandwich bread in the container keeps them perfectly soft.
Freezing
To freeze, simply layer cooled cookies between sheets of wax paper in a freezer container. They’ll hold their flavor and texture for up to two months—just thaw at room temperature when you need a quick chocolate-peanut butter fix.
Reheating
Want your cookies warm, like they’re fresh out of the oven? Microwave one or two for 10 seconds. You’ll revive that soft center and enjoy the swirled flavors all over again.
FAQs
Can I use natural peanut butter for these cookies?
Natural peanut butter can work, but because it tends to be runnier and less sweet, your dough might spread more and taste slightly different. For best results, use standard creamy peanut butter for stability and flavor.
What type Dessert
A fudge-style boxed brownie mix is perfect here, but you can use your favorite brand or even homemade dry brownie mix. If you opt for one that’s particularly dense or dry, just add a splash of milk to bring the dough together.
Can I make these cookies gluten-free?
Absolutely! Use your favorite gluten-free all-purpose flour blend and a gluten-free brownie mix. The cookies will still be deliciously swirled and satisfying.
How do I prevent the swirls from mixing together too much?
Handle the dough gently when marbling—just a few quick twists is all you need. Overworking the dough will blend the colors, so for striking Peanut Butter Brownie Swirl Cookies, less is more!
Can I freeze the dough before baking?
Yes, you can! After swirling and shaping the dough balls, freeze them on a tray, then transfer to a zip-top bag. Bake straight from frozen, just add an extra 1–2 minutes to the bake time.
Final Thoughts
If you crave the magic combo of chocolate and peanut butter, these Peanut Butter Brownie Swirl Cookies are a must-try. They’re fun to make, even more fun to share, and guaranteed to win over anyone lucky enough to snag one from your cookie jar. Go ahead—give your classic cookie game a delicious upgrade!
Print
Peanut Butter Brownie Swirl Cookies Recipe
- Total Time: 32 minutes
- Yield: 24 cookies 1x
- Diet: Vegetarian
Description
Indulge in the perfect combination of peanut butter and brownie with these delightful Peanut Butter Brownie Swirl Cookies. Soft, chewy, and visually stunning, these cookies are a must-try for any dessert lover.
Ingredients
For Peanut Butter Dough:
- 1/2 cup unsalted butter, softened
- 1/2 cup creamy peanut butter
- 1/2 cup granulated sugar
- 1/2 cup brown sugar, packed
- 1 large egg
- 1 tsp vanilla extract
- 1 1/4 cups all-purpose flour
- 1/2 tsp baking soda
- 1/4 tsp salt
For Brownie Swirl:
- 1/2 cup brownie mix (dry)
- 1 tbsp milk (as needed)
Instructions
- Preheat the oven: Preheat the oven to 350°F (175°C) and line baking sheets with parchment paper.
- Cream the ingredients: In a large bowl, cream the butter, peanut butter, granulated sugar, and brown sugar until light and fluffy. Beat in the egg and vanilla extract until well combined.
- Combine dry ingredients: In a separate bowl, whisk together the flour, baking soda, and salt. Gradually mix the dry ingredients into the wet until a soft dough forms.
- Prepare the swirl dough: Divide the dough in half. Mix the dry brownie mix into one half of the dough, adding 1 tablespoon of milk if needed to help combine.
- Create swirl cookies: Pinch off small amounts of each dough and gently swirl or marble them together by hand to form 1.5-inch dough balls. Place the dough balls on prepared baking sheets about 2 inches apart.
- Bake: Bake for 10–12 minutes, or until edges are set and centers are slightly soft. Cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.
Notes
- Don’t over-swirl the dough—gentle marbling gives the best visual effect.
- You can use boxed brownie mix or homemade dry brownie mix.
- These cookies freeze well after baking.
- Prep Time: 20 minutes
- Cook Time: 12 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 1 cookie
- Calories: 160
- Sugar: 11g
- Sodium: 85mg
- Fat: 9g
- Saturated Fat: 4g
- Unsaturated Fat: 5g
- Trans Fat: 0g
- Carbohydrates: 18g
- Fiber: 1g
- Protein: 3g
- Cholesterol: 20mg