S’mores Sandwich Cookies

A s’more is one of those things that’s better in memory than in practice. The idea, toasted marshmallow and melted chocolate pressed between graham crackers, is perfect. The execution, juggling a flaming marshmallow and a snapping cracker while the whole thing slides apart and burns your fingers, is a little less perfect. These s’mores sandwich cookies take everything good about a campfire s’more and put it in a form that needs no fire and no napkins. Soft graham cracker cookies, a real toasted marshmallow buttercream, and a layer of chocolate ganache, all sandwiched together.

They’re a bit of a project, I won’t pretend otherwise. There are three components to make. But none of them is hard, and the payoff is a bakery-worthy cookie that tastes unmistakably like a s’more, only better, because every bite has all three parts in the right proportion instead of whatever survives the fire.

The three parts that make it taste like the real thing

What sells these as s’mores rather than just chocolate cookies is that each element is doing the job its campfire counterpart does, done properly.

The cookies are built on graham cracker crumbs, not just graham flavoring. A full two and a quarter cups of actual crushed grahams go into the dough alongside the flour, plus cinnamon, so the base genuinely tastes like a graham cracker rather than a sugar cookie pretending to be one. And they’re meant to be soft. You pull them from the oven looking slightly underbaked, and they set into a tender, chewy cookie as they cool.

The filling is the part that earns its name. You actually broil real marshmallows until they’re golden and toasty, then beat them into a buttercream with marshmallow fluff. That toasted flavor, the slightly burnt-sugar edge you only get from putting marshmallow under direct heat, is what makes the filling taste like the top of a campfire marshmallow instead of plain sweet frosting.

And the ganache is just chocolate and cream, melted smooth, standing in for the chocolate square. A thin layer is all you need. It’s there to be the chocolate without making the whole thing too rich to finish.

What you need to know about the ingredients

this now & bake later ❤️

For the cookies, the graham cracker crumbs are the star, around 16 full crackers crushed, or a store-bought bag of crumbs. Brown sugar rather than white keeps them soft and adds a little molasses depth. The cornstarch in the dry mix is a small thing that helps keep the cookies tender. Everything else, flour, butter, eggs, vanilla, leaveners, is standard.

For the filling you need regular-size marshmallows, two dozen, not minis and not the jumbo ones, since regular toast most evenly. You’ll also need a jar of marshmallow fluff (the recipe uses Jet-Puffed), room-temperature butter, powdered sugar, and vanilla. The fluff gives the buttercream that stretchy marshmallow quality, and the toasted marshmallows fold in the campfire flavor.

For the ganache, just semi-sweet or dark chocolate chips and a little whipping cream. Dark chocolate balances the very sweet filling nicely if you have the choice.

One important note before you start, especially if you’re serving anyone vegetarian: standard marshmallows and most marshmallow fluff contain gelatin, which is animal-derived, so these cookies are not vegetarian as written. If that matters for your crowd, there are gelatin-free vegetarian and vegan marshmallows and fluff that work in their place.

How to make them

The cookies first. Heat the oven to 350°F and line your baking sheets with parchment. Don’t use silicone mats here, the cookies spread too much on them. Whisk all the dry ingredients together in one bowl. In a larger bowl, beat the butter and brown sugar until light and fluffy, about two minutes, then beat in the eggs and vanilla for another minute. With the mixer on low, add the dry mix and stop as soon as the flour disappears.

Roll the dough into golf-ball-size balls, about 1.2 ounces each, and space them on the sheets. Flatten each to about a quarter inch. A neat trick: lay a small square of parchment on top of each ball and press it down with the flat bottom of a cup, so the dough doesn’t stick. Bake for just 8 to 9 minutes. They’ll look a touch underdone, and that’s right, since they should be soft. Let them cool completely before you even think about filling them. This recipe makes 36 individual cookies, which become 18 sandwiches.

The toasted marshmallow filling. Spread the marshmallows on a parchment-lined, greased sheet and broil them on the middle rack until golden on top, which happens fast, 30 to 60 seconds. Do not walk away. Broilers go from golden to charred in seconds. Flip them and toast the other side, then let them cool. Beat the butter and powdered sugar together until blended, add the vanilla and beat for three minutes until light, then mix in the marshmallow fluff and the cooled toasted marshmallows on low until combined.

The ganache. Pour the cream over the chocolate chips in a microwave-safe bowl and heat for 45 to 60 seconds. Stir until smooth, giving it another 30 seconds if the chips aren’t fully melted. Let it cool to room temperature so it’s spreadable, not runny.

Assembly. Pipe a tablespoon or two of marshmallow filling onto one cookie, staying in from the edge. Spread a thin layer of ganache on a second cookie, also keeping it in from the edge. Press the two together gently so the filling spreads to the rim without squeezing out.

Tips, make-ahead, and storing

A few things help. Keep the marshmallow filling in from the edges, because it spreads when you press, and an overfilled sandwich oozes everywhere. Make sure the cookies are fully cool and the ganache is at room temperature before assembling, or the filling will slide and melt.

You can break the work across time, which makes this much more manageable. The cookies can be baked a day ahead and kept in an airtight container. The ganache can be made ahead and gently rewarmed to spreadable. I’d make the marshmallow filling closer to assembly, since it’s best fresh. Then assembling is quick.

Once assembled, store the sandwiches in an airtight container at room temperature for two to three days. They soften further as they sit, which most people consider a feature. If you want thicker cookies, the recipe has a built-in tweak: drop the graham crumbs to 2 cups and bump the flour to 2 1/3 cups.

Makes 18 sandwich cookies. They’re a little bit of effort and a lot of payoff, the s’more you actually wanted, with none of the smoke in your eyes.

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