Thick, fudgy brownie cookies sandwiched around a luscious peanut butter frosting—yes, they taste just as indulgent as they look. These Brownie Cookie Sandwiches with Peanut Butter Frosting are a match made in dessert heaven. The rich, chewy cookies bring a deep cocoa flavor that perfectly complements the salty-sweet creaminess of the peanut butter filling.

Ideal for when you want to wow a crowd or treat yourself to something extra decadent, these cookie sandwiches strike a balance between brownie-like softness and the handheld joy of cookies. Whether you’re making them for a party, holiday tray, or just a cozy baking day at home, this is one of those recipes that makes the whole kitchen smell like pure comfort.

Preparation Phase & Tools to Use (Essential Tools and Why They Matter)

To ensure the brownie cookies bake evenly and the peanut butter frosting turns out velvety smooth, a few key tools will make your prep easier and more consistent:

Hand or Stand Mixer: Vital for creaming the peanut butter frosting to a fluffy texture and for evenly mixing your cookie dough without overworking it.
Baking Sheets + Parchment Paper: A flat, even surface lined with parchment ensures the cookies don’t stick and bake uniformly.
Cookie Scoop: Helps portion out the dough into consistent sizes, giving you picture-perfect sandwiches.

Cooling Rack: Proper airflow helps the brownie cookies set without turning soggy on the bottoms.
Offset Spatula or Piping Bag: Makes frosting the cookies smoother and more controlled, especially if you want that bakery-style finish.

These tools make baking more efficient and elevate the final result—because when it comes to sandwich cookies, symmetry and texture are everything.

Each ingredient in this recipe plays a starring role in bringing out the chewy, creamy, chocolaty delight that makes these sandwiches so unforgettable:

Unsalted Butter: Adds richness and gives the brownie cookies their soft texture.
Granulated Sugar & Brown Sugar: The combo creates a sweet, caramelized depth and helps the cookies stay moist.

Eggs: Provide structure and help bind the batter while giving the cookies their brownie-like chewiness.
Vanilla Extract: Rounds out the sweetness and enhances all the other flavors.
All-Purpose Flour: Gives body to the cookies while keeping them soft and tender.

Cocoa Powder (unsweetened): Brings the deep, rich chocolate taste that makes these cookies so fudge-like.
Baking Soda & Salt: Ensure proper rise and balance the sweetness.
Creamy Peanut Butter: Used in the frosting, it adds a bold, nutty flavor that pairs beautifully with the chocolate cookies.

Powdered Sugar: Helps create a thick yet fluffy frosting that holds its shape.
Heavy Cream or Milk: Adjusts the frosting to the perfect spreadable consistency.

In a mixing bowl, beat together the softened butter and sugars until light and creamy. Add eggs one at a time, followed by vanilla extract. Mix until smooth.

In a separate bowl, whisk together flour, cocoa powder, baking soda, and salt. Gradually add the dry mixture to the wet ingredients, mixing until just combined. The dough should be thick and slightly sticky.

Step 2: Scoop and Bake

Preheat your oven to 350°F (175°C) and line baking sheets with parchment paper. Use a cookie scoop to portion out equal-sized balls of dough onto the prepared sheets, leaving space between each.

Bake for 9–11 minutes, until the edges are set but the centers are still soft. Cool on the tray for a few minutes before transferring to a wire rack.

Step 3: Make the Peanut Butter Frosting

In a clean bowl, beat the peanut butter and softened butter together until smooth. Gradually add powdered sugar and a splash of cream or milk, mixing until light and fluffy. Adjust the consistency with more cream if needed.

Step 4: Assemble the Sandwiches

Once cookies are completely cool, spread or pipe a generous layer of frosting onto the flat side of half the cookies. Top each with a second cookie, pressing gently to sandwich them together.

Serve these Brownie Cookie Sandwiches with Peanut Butter Frosting at room temperature for the best texture and flavor. The frosting softens slightly, and the brownie cookies reach their ideal chewy consistency. They’re perfect with a cold glass of milk, a cup of coffee, or as a standout treat on a dessert table.

To store, place them in an airtight container at room temperature for up to 3 days. For longer storage, refrigerate them for up to a week—just let them come to room temp before serving. You can also freeze the assembled sandwiches for up to 2 months; wrap each individually and thaw as needed.

Frequently Asked Questions

How do I make the cookies extra fudgy?

Use room temperature ingredients and don’t overbake! The centers should still look slightly soft when they come out of the oven—they’ll firm up as they cool.

Can I use natural peanut butter for the frosting?

You can, but the texture may be looser and slightly oilier. For best results, use a creamy processed peanut butter that holds its shape better.

Can I make the frosting ahead of time?

Absolutely. You can make the peanut butter frosting up to 2 days in advance. Store it in an airtight container in the fridge and re-whip it slightly before using.

Do these need to be refrigerated?

Not necessarily, unless your kitchen is warm. At room temperature, they’ll hold up fine for a few days. If you prefer firmer frosting, the fridge is your friend.

No problem! You can use a tablespoon to portion the dough. Just try to keep the size consistent so your sandwiches pair up evenly.

Can I add chocolate chips or nuts?

Definitely! Chocolate chips will boost the richness, and chopped peanuts or pecans will add a bit of crunch. Just don’t overload the dough—2/3 cup of add-ins is a good starting point.

If you loved these Brownie Cookie Sandwiches with Peanut Butter Frosting, you’ll definitely want to check out more of our reader-favorite treats:

Whipped Shortbread Cookies for a melt-in-your-mouth buttery delight.

Lemon Churro Cookies when you’re craving a citrus-spice fusion.
Paula Deen’s 5-Minute Fudge if you want something quick but still rich and indulgent.
Apple Enchiladas for a fruity, comforting twist on dessert.

Pineapple Coconut Dream Cake if tropical flavor is your vibe.

Save This Recipe for Later

📌 Save this recipe to your Pinterest dessert board so you can come back to it any time: Life With Olivia on Pinterest

And let me know in the comments how yours turned out! Did you add chocolate chips or swirl in Nutella? Try a different nut butter? I’d love to hear how you made it your own.

Feel free to ask questions, too—this space is all about sharing and enjoying the process of baking.

Brownie Cookie Sandwiches with Peanut Butter Frosting

Author: Olivia McKenney
Total Time: 30 minutes

Yield: 12 cookie sandwiches
Diet: Vegetarian

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Description

Thick, fudgy brownie cookies sandwiched around a light, fluffy peanut butter frosting. This dessert strikes a perfect balance between rich chocolate and creamy peanut butter—ideal for holidays, parties, or just because.