July 23, 2024


Than a Food Fitter

Peanut Butter Filled Brownie Cookies

9 min read


These peanut butter filled brownie cookies are soft and fudge-like with a creamy peanut butter ripple swirled throughout. The brownie dough uses melted chocolate AND cocoa powder for extra chocolate flavor and the peanut butter filling requires just 2 ingredients. Warning: these are quite indulgent!

stack of peanut butter filled brownie cookies broken in half

Sometimes you just need a cookie. Last month it was my mission to bake some sort of stuffed peanut butter/chocolate cookie creation. I have recipes for both peanut butter swirl brownies and peanut butter stuffed brownies (and pb cup stuffed chocolate cookies in my cookbook) and questioned if this was really even necessary…

But then I came to my senses because (hello!?) a cookie is always necessary. The test batches garnered rave reviews, so I knew this recipe had to be published ASAP.

These Peanut Butter Filled Brownie Cookies Are:

  • Sweet and chewy like a brownie
  • Shiny and crackly on top
  • Unapologetically rich and indulgent
  • Filled and marbled with a soft peanut butter filling like the inside of peanut butter balls and peanut butter Easter eggs (so good!!)
brownie cookies filled with peanut butter on wooden cutting board

The full printable recipe is below, but let me point out some things to know before you get started.

Peanut Butter Filling

The first thing you’re going to do is make the peanut butter filling using equal parts confectioners’ sugar and peanut butter. Stir them together (no need for a mixer) until combined and then roll into teaspoon-size balls as best you can. Like the filling from these cream cheese red velvet cookies (what a mouthful), the peanut butter filling must be extremely cold. Chill the peanut butter filling in the freezer for at least 1 hour as you make and chill the cookie dough.

  1. Can I use natural peanut butter? Yes. It doesn’t spread as much in the oven, so the cookies with natural peanut butter were a bit more lumpy, but still tasted great! I used creamy unsalted natural peanut butter that had been in the fridge, and it took a little bit more arm muscle and time to stir the confectioners’ sugar into it (compared with the conventional peanut butter), but it did smooth out—just keep at it.
  2. Can I use a peanut butter alternative? Yes. For nut-free alternatives, you can use Biscoff cookie butter or sunflower seed butter spread. My team and I have not tested this recipe with almond butter, but I don’t see any issue using that instead.

Brownie Cookie Dough Ingredients

Now that the peanut butter balls are in the freezer, you can start the brownie cookie dough. Have you ever made my brownie cookies before? They’re a hit whenever I make them and you might love them even more marbled with peanut butter. A few key ingredients you need include cocoa powder, brown & white sugars, eggs, room temperature butter, flour, espresso powder, and chocolate.

Espresso powder is optional for a deeper chocolate flavor. If you don’t have it, just skip it.

chocolate bars, cocoa powder, brown and white sugars, eggs, and other ingredients

Success Tip: Best Chocolate to Use

Since most of the cookie’s chocolate flavor comes from melted chocolate, do not cut corners. Use pure chocolate baking bars such as Ghirardelli (not affiliated, just love their chocolate). You can find them right next to the chocolate chips in the baking aisle. They’re typically sold in 4 ounce bars and you need 8 ounces for this recipe.

  • I use and recommend semi-sweet chocolate, but you can use bittersweet or unsweetened chocolate for a much darker flavor. In the pictured cookies, I used 4 ounces semi-sweet and 4 ounces bittersweet.

The cookie dough is practically brownie batter, so it needs to chill in the refrigerator for 1 hour before you can shape it with the peanut butter filling. Very sticky before chilling:

brownie cookie dough in glass bowl

Look how much it solidifies after 1 hour in the refrigerator. This is exactly what you want:

Let’s Shape These Peanut Butter Filled Brownie Cookies

Using a Tablespoon measuring spoon, scoop out a heaping mound of the brownie cookie dough. It will be pretty hard after chilling, but will soften up in your hands as you roll it. (I don’t recommend using a cookie scoop for this dough because the dough is too hard and sticky. I tried it and my cookie scoop went on strike.) Now the exact marbling/shaping process:

photo collage displaying the order of shaping the brownie dough balls
  1. Roll the dough in your hands to make a ball and then press your thumb into the ball as if you were making a thumbprint cookie.
  2. Press a peanut butter ball into the indentation and break off a small piece of the brownie dough.
  3. Smush (yes, that’s the technical term) the piece of brownie cookie dough you’d taken away back on top of the peanut butter filling.
  4. Mold it all together as you reroll it into a ball. It will look a little marbled.

YOUR HANDS WILL GET MESSY in this process, fair warning.

Every cookie will look different, which only adds to their alluring charm. 🙂

chocolate dough balls swirled with peanut butter on lined baking sheet
peanut butter swirled brownie cookies on wire cooling rack

3 Final Success Tips

  1. Don’t overthink the shaping step. The marbling/swirling doesn’t have to be perfect. In fact, it’s fun that every single cookie looks different!
  2. Shape only a few at a time. The peanut butter filling softens up extremely quickly after you take it out of the freezer, and quickly becomes softer than the brownie cookie dough. I recommend taking about 6 peanut butter balls out of the freezer at a time, leaving the rest in the freezer while you’re shaping the first bunch.
  3. Clean-ish hands. Wipe or wash your hands clean after you shape a few cookies. Once your hands are really messy, the dough becomes unworkable. I usually shape 6, freshen up my hands, shape another 6, etc.


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Take rich and chewy brownie cookies to the next level with a creamy peanut butter swirl! Both the peanut butter filling and cookie dough must chill before shaping. Review shaping success tips above the recipe.

Peanut Butter Filling

Cookie Dough

  1. Make the peanut butter filling: In a small bowl, mix the peanut butter and confectioners’ sugar together until combined and smooth. You can just use a spoon for this. Mixture is thick, yet soft. With a teaspoon, scoop out a spoonful of peanut butter mixture (about 6g), and roll into a ball. Place on a parchment paper-lined baking sheet, plate, or tray. Repeat with remaining mixture until you have 24 peanut butter balls. Loosely cover and freeze for at least 1 hour and up to 1 day. (I usually just freeze them for a little over 1 hour, which is the amount of time it takes to make and chill the brownie cookie dough.)
  2. Make the brownie cookie dough: Melt the chocolate in a double boiler or use the microwave. Microwave in 20-second increments, stirring after each until completely melted. Set aside to slightly cool.
  3. Meanwhile, whisk the flour, cocoa powder, espresso powder, baking powder, and salt together. Set aside. In a large bowl using a handheld or stand mixer fitted with a paddle attachment, beat the butter, brown sugar, and granulated sugar together on medium-high speed until smooth and creamy, about 2 minutes. Add the eggs and vanilla extract, and beat on high speed for 2 full minutes. Scrape down the sides and up the bottom of the bowl, then beat on high for 1 more minute. Pour in the slightly cooled melted chocolate and mix on medium-high speed for 2 full minutes. Pour the dry ingredients into the wet ingredients and beat on low speed until combined. 
  4. Cover and chill the dough in the refrigerator for 1 hour. If chilling for longer, allow the cookie dough to sit at room temperature for 10-15 minutes before rolling and shaping in step 6.
  5. After chilling, preheat oven to 350°F (177°C). Line large baking sheets with parchment paper or silicone baking mats
  6. Shape the cookies: The peanut butter filling softens up extremely quickly after you take it out of the freezer. I recommend taking about 6 peanut butter balls out of the freezer at a time, leaving the rest in the freezer while you’re shaping the first bunch. Using a sturdy tablespoon, scoop out a heaping spoonful of the cookie dough and roll into a ball, about 1.5 Tablespoons/30g/1 ounce of dough each. The dough will be quite stiff. Make an indentation with your thumb, and place a frozen peanut butter ball in the indentation. Pinch off a piece of the brownie cookie dough and press it on top of the peanut butter filling, and then roll the whole thing together into a smooth ball. Feel free to pull off pieces of brownie dough to expose more peanut butter and then re-roll together; peanut butter can also be hidden inside the cookie dough if you don’t want a marbled look. Repeat with remaining cookie dough and peanut butter balls. (Warning: your hands get messy in this step!)
  7. Place dough balls 3 inches apart on the baking sheets and bake for 12-13 minutes or until the edges appear set. The centers will be quite soft, but will set up as the cookies cool.
  8. Remove from the oven and allow cookies to cool on the baking sheet for 10 minutes before transferring to a wire rack to cool completely.
  9. Cookies stay fresh covered at room temperature for up to 1 week.


  1. Make Ahead Instructions: Baked cookies freeze well for up to 3 months. Unbaked cookie dough balls freeze well for up to 3 months. Bake frozen cookie dough balls for an extra minute, no need to thaw. Cookies won’t spread as much if dough balls were frozen, so about halfway through bake-time, gently press down on the baking cookies with a spoon to help get them to spread. Learn some of my best practices for How to Freeze Cookie Dough.
  2. Peanut Butter: At the time of publication, there is a recall on Jif peanut butters. Please consider researching the recall information and use another brand of peanut butter in this recipe. We tested it with Skippy Creamy, Justin’s Natural Creamy, and Wegmans brand Natural Creamy. If using natural and the oil has separated to the top of the jar, make sure you stir it well before measuring. Room temperature peanut butter is easiest to mix. I do not recommend crunchy peanut butter because it doesn’t mix very easily with the confectioners’ sugar.
  3. Peanut Butter Alternatives: For a nut-free alternative, you can use Biscoff cookie butter or sunflower seed butter spread. My team and I have not tested this recipe with almond butter, but I don’t see any issue using that instead!
  4. Chocolate: Use pure chocolate baking bars. You can find them right next to the chocolate chips in the baking aisle. They are sold in 4 ounce bars, so you’ll need 2. I use and recommend semi-sweet chocolate, but you can use bittersweet or unsweetened chocolate (or a combination of any) for a darker chocolate flavor.
  5. Espresso Powder: Espresso powder deepens the chocolate flavor. You can skip it or use 2 teaspoons of instant coffee powder instead.

Keywords: peanut butter brownie cookies

How to Join the June Sally’s Baking Challenge

We don’t usually have a cookie recipe as a Sally’s Baking Challenge, so this is something fun for June! Make peanut butter filled brownie cookies as directed. (You can use a peanut butter alternative as directed in the Notes if needed.) If you aren’t into this recipe, here is the alternate baking challenge recipe:

  1. Any previous challenge recipe you haven’t made yet OR
  2. Banana Cream Pie

After you make the cookies or alternate recipe, email us your recipe photo. For a bonus entry, leave a review on the recipe below.

By emailing your recipe photo to us, you are automatically entered in the baking challenge. 1 winner receives a $250 Amazon Gift Card. The challenge is open to the whole world. Challenge ends on June 30th at 5pm Eastern. The winner will be selected at random, emailed the prize, and posted in the July Baking Challenge blog post on July 1st.

Visit the Sally’s Baking Challenge page if you have any questions about Sally’s Baking Challenge.


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