Easy peanut butter s’mores cookies recipe with chocolate and marshmallow. A quick, gooey dessert perfect for any occasion.
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Why You’ll Love This Recipe
Peanut Butter S’mores Sandwich Cookies bring together three strong dessert flavors in one bite: salty peanut butter, soft marshmallow, and melted chocolate. The cookie itself is flourless, which gives it a rich peanut flavor and a tender, slightly crumbly texture rather than a cakey one. During testing, the best cookies came from mixing the peanut butter and sugars until the dough looked smooth and thick, then baking just until the edges were set. That short bake keeps the centers soft enough to sandwich without cracking.
The flavor is warm and nostalgic, but not plain. The peanut butter gives a roasted, nutty aroma as the cookies bake, while the brown sugar adds a mild molasses note that works beautifully with chocolate. Once filled, the marshmallow brings the familiar stretchy sweetness of a s’more, and the chocolate melts into the ridges of the cookie. If you add a few crushed graham crackers, the cookies pick up a toasty crunch that makes them feel even closer to a campfire dessert.
One mistake that can happen with this recipe is overbaking the peanut butter cookies. I have tested batches that looked only slightly darker, but once cooled, they became too brittle to press into sandwiches. The fix is to remove them when the edges are lightly golden and the centers still look a little soft. They will firm as they cool on the tray. If they do crack, do not toss them; use the broken pieces for a quick layered dessert with marshmallow fluff and melted chocolate.
The assembly works best when the cookies are fully cool but the chocolate is warm and glossy. Warm cookies can melt the marshmallow too quickly and make the filling slide out. A gentle press is all you need. The finished sandwich should feel soft at first bite, creamy in the center, and just a little sticky from the marshmallow. It is a small-batch style cookie that tastes like peanut butter blossoms met a fireside s’more, with enough texture contrast to make each bite interesting.
Peanut Butter S’mores Sandwich Cookies
Ingredients
Equipment
Method
- Make the Cookie Dough
- Preheat oven to 350°F (175°C).
- In a bowl, mix peanut butter, granulated sugar, and brown sugar until smooth.
- Add egg and vanilla; mix well.
- Stir in baking soda and salt until combined.
- Shape & Bake
- Scoop dough into small balls (about 1 tbsp each).
- Place on a lined baking sheet and flatten slightly with a fork (classic crisscross pattern).
- Bake for 10–12 minutes until edges are lightly golden.
- Let cool completely.
- Prepare the Filling
- If using marshmallows, microwave briefly (10–15 sec) until soft.
- Melt chocolate in microwave in 20-second intervals, stirring until smooth.
- Assemble the Sandwich Cookies
- Spread marshmallow fluff on one cookie.
- Add melted chocolate or place chocolate pieces on top.
- Sandwich with another cookie and gently press together.
Notes
Don’t overbake—cookies should stay soft for best texture.
Add crushed graham crackers for extra s’mores vibes.
Expert Tips & Techniques
Use creamy shelf-stable peanut butter for the most reliable texture. Natural peanut butter can work, but only if it is stirred very well; excess oil can make the dough spread, while dry peanut butter from the bottom of the jar can make the cookies crumbly. The dough should feel thick and scoopable, almost like soft modeling clay.
Chill the dough for 15 to 20 minutes if it feels sticky. Peanut butter softens quickly in a warm kitchen, and chilling helps the cookies hold their shape. Press the fork pattern gently rather than flattening too much. A slightly thicker cookie makes a sturdier sandwich and gives the marshmallow filling something to grip.
Let the cookies cool completely before filling. This is a small detail that prevents a big mess. Warm cookies soften marshmallow fluff until it slides out, and they can make melted chocolate too loose. If using large marshmallows, microwave them for only 10 to 15 seconds, just until puffed and spreadable. Overheated marshmallows become stringy, hot, and difficult to control.
For a toasted s’mores flavor, use a kitchen torch lightly on the marshmallow before adding the top cookie. Keep the flame moving so the sugar browns instead of burns. Store assembled sandwich cookies in an airtight container at room temperature for one day, or refrigerate for firmer filling. For the best texture, let chilled cookies sit at room temperature for 10 minutes before serving.
Variations & Alternatives
For a stronger campfire flavor, roll the edges of the filled cookies in crushed graham crackers. The crumbs stick to the marshmallow and add a sandy crunch that balances the soft peanut butter cookie. You can also mix a few tablespoons of graham cracker crumbs directly into the dough, but do not add too much or the cookies may dry out.
Dark chocolate gives these sandwich cookies a deeper cocoa taste and keeps the filling from feeling overly sweet. Milk chocolate makes them taste closer to a classic candy bar, while chopped chocolate bars melt more smoothly than chips. For a salty finish, sprinkle a few flakes of sea salt over the melted chocolate before closing the sandwich.
For a nut-free variation, use sunflower seed butter, though the flavor will be earthier and the cookies may spread a bit more. For gluten-free serving, the base cookie is naturally flourless, but check labels on marshmallow fluff, chocolate, and any graham-style crumbs. Mini marshmallows can be used instead of fluff, but they should be softened briefly so they press evenly between the cookies.
Frequently Asked Questions
- Q: Why did my peanut butter cookies fall apart? They may have been overbaked or moved too soon. Let them cool on the baking sheet until firm, then transfer gently to a rack.
- Q: Can I use natural peanut butter? Yes, but it must be very well stirred and not overly oily. Standard creamy peanut butter gives the most consistent shape and texture.
- Q: Can I make these sandwich cookies ahead of time? You can bake the cookies one day ahead and fill them closer to serving. Once filled, the marshmallow is softest and freshest on the same day.
- Q: How do I keep the filling from sliding out? Cool the cookies completely, use a modest amount of marshmallow, and press gently. Too much warm filling will squeeze out the sides.
- Q: Can I freeze Peanut Butter S’mores Sandwich Cookies? Freeze the plain baked cookies, not the assembled sandwiches. Thaw, then add marshmallow and chocolate for the best texture.
