Peanut Butter Brownie Swirl Cookies Recipe

I just fused Peanut Butter Brownies and cookie dough into a marbled cookie that will make every other dessert seem boring.

I’m obsessed with these Peanut Butter Brownies turned swirl cookies. I love how the peanut butter and fudgy brownie bits fight for space in every bite.

I can’t stop thinking about the way creamy peanut butter folds into dark chocolatey swirls with a hit of unsweetened cocoa powder in there. They look casual but feel kind of gourmet cookies, like something I smuggled home from a bakery.

And they crash every dessert hierarchy at parties, people argue over who gets the last one. Honestly, they’re exactly the kind of cookie I crave when I want both peanut butter and chocolate.

Ingredients

• Unsalted butter (softened): Basically makes peanut dough rich and tender.
• Creamy peanut butter: Adds nutty creaminess and a little protein punch.
• Granulated sugar (peanut dough): Keeps cookies crisp at the edges.
• Light brown sugar: Brings chewiness and a hint of caramel.
• Large egg + yolk: Makes dough moist and gives structure.
• Vanilla extract (peanut): It’s warm and rounds out nuttiness.
• All-purpose flour (peanut): Gives cookie body so it holds together.
• Baking soda: Helps cookies spread and brown nicely.
• Baking powder: Adds a tiny lift, keeps texture light.
• Fine salt (peanut): Balances sweetness and makes flavors pop.
• Unsalted butter (melted): Basically the fudgy base for brownie batter.
• Granulated sugar (brownie): Sweetens and gives that classic brownie crust.
• Eggs (brownie): Bind everything and make the brownie cakey or fudgy.
• Vanilla extract (brownie): It’s a background warmth in chocolate batter.
• Unsweetened cocoa powder: Packs chocolate intensity and that bitter edge.
• All-purpose flour (brownie): Keeps brownie structure without getting cakey.
• Salt (brownie): Small pinch sharpens the chocolate taste.
• Semisweet chocolate chips: Adds melty pockets and extra chocolate hits.
• Flaky sea salt: Plus it gives that bakery-style finishing contrast.

Ingredient Quantities

• 1/2 cup (115g) unsalted butter, softened for the peanut butter dough
• 1/2 cup (120g) creamy peanut butter, smooth or chunky is fine
• 3/4 cup (150g) granulated sugar
• 1/2 cup (100g) packed light brown sugar
• 1 large egg + 1 large egg yolk (eggs at room temp)
• 1 tsp vanilla extract
• 1 1/4 cups (155g) all purpose flour for the peanut butter dough
• 1/2 tsp baking soda
• 1/4 tsp baking powder
• 1/4 tsp fine salt
• 1/2 cup (115g) unsalted butter, melted for the brownie batter
• 1 cup (200g) granulated sugar for the brownie batter
• 2 large eggs for the brownie batter
• 1 tsp vanilla extract for the brownie batter
• 1/3 cup (35g) unsweetened cocoa powder, sifted
• 1/2 cup (65g) all purpose flour for the brownie batter
• 1/4 tsp salt for the brownie batter
• 1/2 cup (85g) semisweet chocolate chips or chopped chocolate, optional but great
• Flaky sea salt for sprinkling on top, optional

How to Make this

1. Preheat oven to 350F (175C) and line two baking sheets with parchment paper; set a rack in the middle of the oven.

2. Make the peanut butter dough: cream 1/2 cup (115g) softened butter, 1/2 cup (120g) creamy peanut butter, 3/4 cup (150g) granulated sugar and 1/2 cup (100g) packed light brown sugar until light and a bit fluffy. Beat in 1 large egg plus 1 large egg yolk and 1 tsp vanilla until combined.

3. Whisk together 1 1/4 cups (155g) all purpose flour, 1/2 tsp baking soda, 1/4 tsp baking powder and 1/4 tsp fine salt. Fold the dry ingredients into the peanut butter mixture until just mixed, don’t overwork it. Chill this dough while you make the brownie batter, about 15 to 20 minutes helps it be less sticky.

4. Make the brownie batter: whisk together 1/2 cup (115g) melted unsalted butter and 1 cup (200g) granulated sugar until smooth. Add 2 large eggs and 1 tsp vanilla and whisk until glossy.

5. Sift 1/3 cup (35g) unsweetened cocoa powder with 1/2 cup (65g) all purpose flour and 1/4 tsp salt, then fold these into the wet brownie mixture until combined. Stir in 1/2 cup (85g) semisweet chocolate chips or chopped chocolate if using. The batter should be thick but scoopable.

6. Portion the doughs: scoop about 1 tablespoon of peanut butter dough and 1 tablespoon of brownie batter for each cookie. To make a marbled swirl drop the peanut butter dough first, then a dollop of brownie batter on top and gently press together so they stick but still show two colors. If doughs are very soft chill scoops for 10 minutes before baking.

7. Place scoops 2 inches apart on the prepared sheets. For a prettier swirl use a small offset spatula or the back of a teaspoon to gently swirl the two doughs together once on the sheet, don’t overmix or it will turn all brown.

8. Sprinkle optional flaky sea salt on top of each cookie and bake 9 to 12 minutes, until edges are set and centers look slightly soft. For fudgier, brownie like centers err on the shorter side of time.

9. Let cookies cool on the baking sheet for 5 minutes so they finish setting, then transfer to a wire rack to cool completely. They will firm up as they cool.

10. Store airtight at room temperature for up to 4 days or freeze baked cookies for longer. Tip: if dough is too sticky to handle, chill in the freezer for 10 minutes between scooping batches; and for extra shine warm a few chocolate chips and drizzle on top once cooled.

Equipment Needed

1. Oven and two rimmed baking sheets lined with parchment paper
2. Stand mixer or hand mixer (or a sturdy bowl and a wooden spoon if you’re into arm workouts)
3. Mixing bowls (one for peanut butter dough, one for brownie batter)
4. Measuring cups and spoons plus a kitchen scale if you like precision
5. Whisk and rubber spatula for folding and scraping
6. Sifter or fine mesh strainer for the cocoa and dry ingredients
7. Tablespoon scoop or small cookie scoop and a teaspoon or small offset spatula for swirling
8. Wire cooling rack to let cookies finish setting
9. Small bowl and spoon for optional flaky sea salt or melted chocolate drizzle

FAQ

Peanut Butter Brownie Swirl Cookies Recipe Substitutions and Variations

• 1/2 cup unsalted butter (for peanut butter dough): substitute with 1/2 cup coconut oil, solid but softened, for a slightly tropical flavor; or use 1/2 cup salted butter, and just reduce the added salt in the recipe by about 1/4 tsp.
• 1/2 cup creamy peanut butter: swap for 1/2 cup almond butter or cashew butter for a milder nut taste; or if nut-free needed, use 1/2 cup sunflower seed butter (may brown a bit faster when baking).
• 3/4 cup granulated sugar: replace with 3/4 cup coconut sugar for a deeper, caramel note (color will be darker), or use 2/3 cup maple syrup but reduce other liquids slightly and chill dough well since syrup adds moisture.
• 1 large egg + 1 large yolk: for egg-free, use a flax “egg” (1 tbsp ground flax + 3 tbsp water per egg, so 4 tbsp flax mix total) or 1/2 cup applesauce plus 1 tbsp neutral oil for similar moisture, though texture will be a bit cakier.

Pro Tips

1. Chill both doughs when they get too soft. If the peanut butter or brownie scoop is sagging, pop the scoops on a tray in the freezer for 10 minutes. It keeps the swirl defined and stops them from spreading into one brown blob.

2. Weigh your flour if you can. A packed or over-fluffed cup will give you denser cookies. 155g and 65g are much more reliable than guessing, so you’ll get consistent texture every bake.

3. For a prettier swirl, drop the peanut butter dollop first, then the brownie on top, and press just once with the back of a spoon. Too much swirling makes everything brown. Also resist overhandling the dough or the cookies will get tough.

4. Watch the bake time to control chewiness. 9 minutes gives fudgy, brownie-like centers; closer to 12 minutes makes them cakier and more cookie-like. They keep cooking on the hot sheet, so pull them when centers still look a little soft.

5. Finish smart: a quick sprinkle of flaky sea salt after they come out of the oven brightens the flavors. You can also warm a few chips and drizzle them for shine, or freeze baked cookies in an airtight bag and thaw on the counter for a near-fresh taste.