S’mores Cookie Bars Recipe

These gooey S’mores Cookie Bars pack a rich graham cracker dough, melted chocolate, and marshmallow creme into an easy, sliceable bake you will love.

About Ingredients Instructions Servings Tips Substitutes

Why This Recipe Works:

• Graham cracker crumbs absorb moisture differently than flour, creating a tender, sandy crumb structure that mimics a real campfire treat.
• Marshmallow creme contains egg whites and corn syrup, preventing it from dissolving into the dough during baking like standard marshmallows do.
• A high ratio of brown sugar guarantees a soft, chewy texture by retaining moisture through its natural hygroscopic properties.

My kitchen counter still bears a faint, sticky ring from the night I tried to torch marshmallows indoors, nearly setting off the smoke detector. That chaotic evening drove me to create a far more reliable, oven-friendly way to get my campfire fix.

These bars deliver that exact smoky, gooey magic without the open flame. They are hands down a triumph of texture.

The secret lies in replacing a portion of the flour with finely ground graham crumbs, which alters the gluten development and yields a wonderfully sandy, tender crumb. By sandwiching a thick layer of commercial or homemade marshmallow creme between the dough, we prevent the filling from evaporating. Standard marshmallows dissolve into sugary craters, but the stabilized egg whites in the creme hold up beautifully under heat.

It is pure food science at work.

When assembling, your hands will get messy because the dough clings to everything it touches. I highly recommend dampening your fingertips with cold water to press the sticky base layer into the pan without tearing it.

I always use Diamond Crystal kosher salt. One teaspoon of these light flakes equals a half-teaspoon of table salt.

Once cooled, these bars slice into neat, heavy squares with a gorgeous, variegated top where toasted marshmallow peaks peek through golden cookie dough. They smell intensely of caramelized sugar and warm vanilla, with a satisfying chew that rivals my favorite The Best Soft Chocolate Chip Cookies. It is a nostalgic masterpiece that actually travels well.

S’mores Cookie Bars

• Publisher RecipeVolt
• Cuisine American
• Category Desserts, Cookie Bars
• Prep Time 15 mins
• Cook Time 25 mins
• Servings 16
• Calories 240 calories
• Rating 4.8 387
• Tags S'mores, Chocolate, Marshmallow, Graham Cracker

Ingredients

• 1/2 cup ( 8 Tbsp ; 113g ) unsalted butter , softened to room temperature
• 3/4 cup ( 150g ) packed light or dark brown sugar
• 1 large egg , at room temperature
• 1 teaspoon pure vanilla extract
• 1 cup ( 125g ) all-purpose flour ( spooned & leveled )
• 1 cup ( 120g ) graham cracker crumbs (about 8 full-sheet graham crackers)
• 1/2 teaspoon baking powder
• 1/4 teaspoon salt
• 1 cup ( 180g ) semi-sweet chocolate chips
• 1 heaping cup marshmallow creme (store-bought “Fluff” or 1/2 recipe of homemade marshmallow creme)

Directions

1. Preheat your oven to 350°F (177°C). Line an 8-inch or 9-inch square baking pan with parchment paper, ensuring you leave a generous overhang on the sides to serve as handles later.
2. In a large bowl, use a handheld or stand mixer fitted with the paddle attachment to cream the softened butter and brown sugar together on medium-high speed for about 3 minutes until light and fluffy. Beat in the room-temperature egg and vanilla extract, scraping down the sides of the bowl with a spatula to ensure everything is fully incorporated.
3. In a separate bowl, whisk together the all-purpose flour, graham cracker crumbs, baking powder, and salt. Gradually pour these dry ingredients into the wet mixture, mixing on low speed just until a soft, cohesive dough forms.
4. Press two-thirds of the sticky graham dough into the bottom of your prepared pan, using damp fingers to smooth it into an even layer. Spread the marshmallow creme over the dough, then scatter the semi-sweet chocolate chips evenly across the sticky surface.
5. Scatter small, flattened pieces of the remaining cookie dough over the chocolate chips, leaving gaps so the marshmallow and chocolate can peek through. Bake for 25 to 30 minutes until the top is beautifully golden brown, then transfer the pan to a wire rack to cool completely.
6. Once fully cooled, use the parchment paper handles to lift the block out of the pan, place it on a cutting board, and slice into 16 even squares.

Notes

Keep these essential tips in mind to ensure your cookie bars turn out perfectly every single time:

• **Salt Conversion:** This recipe is tested using Diamond Crystal kosher salt. If you are using standard table salt or fine sea salt, reduce the measurement by half (to 1/8 teaspoon) to prevent the bars from tasting overly salty.
• **The Marshmallow Rule:** Do not substitute regular marshmallows or mini marshmallows for the marshmallow creme. Standard marshmallows melt completely during baking, leaving empty, sticky craters in your bars, whereas the egg whites in marshmallow creme stabilize the structure against the oven's heat.
• **Watch the Topping:** Keep a close eye on the oven during the final 5 minutes of baking. The exposed marshmallow creme can turn from a perfect golden brown to burnt and bitter very quickly; if it browns too fast, tent the pan loosely with aluminum foil.
• **Room Temperature Storage:** Keep these bars in an airtight container at room temperature for up to 1 week. For longer storage, freeze the sliced bars between layers of parchment paper in a freezer-safe container for up to 3 months, thawing them overnight in the fridge before serving.
• **Feeding a Crowd:** To make these in a 9x13-inch pan, simply double all the ingredients. The baking time will increase slightly to about 35 to 38 minutes.
• **Graham Cracker Alternatives:** If graham crackers are unavailable in your region, digestive biscuits make an excellent 1:1 substitute by weight. Grind them finely to match the texture of graham crumbs.

Serving Suggestions

Enhance your Desserts experience by pairing these rich, sweet bars with contrasting flavors and textures:

• Pair with a cold glass of unsweetened almond milk to cut through the intense sweetness of the marshmallow layer.
• Serve alongside a scoop of tart raspberry sorbet to provide a bright, acidic contrast to the rich chocolate.
• Drizzle with a pinch of flaky sea salt right before serving to balance the deep brown sugar notes.
• Enjoy alongside a hot cup of black espresso, which complements the caramelized, toasted marshmallow edges.
• Incorporate them into a Desserts platter next to salty pretzels to create a satisfying sweet-and-salty balance.

Storage and Reheating

Storing these bars is incredibly straightforward, but you must let them cool completely before packing them away. If you seal them while they are still warm, the trapped steam will turn the crisp graham cracker crust soft and soggy. Keep them in a single layer, or separate layers with parchment paper so they do not fuse into a single giant block.

At room temperature, they will remain remarkably soft and chewy for up to 7 days. Over time, the moisture from the marshmallow creme will slowly migrate into the cookie dough, making the bars slightly softer on day three than they were on day one, though many find this texture even more appealing. If you love bar Dessertss that keep well, these are right up there with my 1-Bowl Salted Butterscotch Blondies.

If you want to freeze them, slice the bars first. Wrap each square tightly in plastic wrap before placing them in a heavy-duty freezer bag for up to 3 months. When the craving strikes, let them thaw on the counter for about an hour to restore their original chewiness.

For an extra-gooey experience that mimics a fresh-from-the-campfire treat, pop a single bar onto a microwave-safe plate. Heat it on medium power for just 8 to 10 seconds to soften the chocolate and make the marshmallow stretch again.

Ingredient Substitutes

If you need to adapt the recipe for dietary needs or pantry limitations, try these tested swaps:

1. **Unsalted Butter → Virgin Coconut Oil:** Substitute at a 1:1 ratio (113g). Ensure the oil is solid but scoopable, and chill the dough for 10 minutes before baking to prevent excessive spreading.
2. **Brown Sugar → Coconut Sugar:** Substitute at a 1:1 ratio (150g). Because coconut sugar is drier, add 1 teaspoon of molasses to the wet ingredients to maintain the necessary moisture level.
3. **Graham Cracker Crumbs → Gluten-Free Graham Crumbs:** Substitute at a 1:1 ratio (120g). Increase the resting time of the mixed dough by 5 minutes to allow the gluten-free crumbs to fully hydrate.
4. **Semi-Sweet Chocolate Chips → Dark Chocolate Chunks (70% Cacao):** Substitute at a 1:1 ratio (180g). Chop the chunks coarsely to create pockets of intense, bitter contrast against the sweet marshmallow.
5. **All-Purpose Flour → White Whole Wheat Flour:** Substitute at a 1:1 ratio (125g). Reduce the total flour amount by 1 tablespoon to prevent the cookie dough from becoming too dry and crumbly.

There is something deeply comforting about pulling a pan of these golden, bubbly bars out of the oven on a quiet afternoon. They bring all the joy of a backyard bonfire right into the warmth of your kitchen, minus the smoky clothes. I hope they find a permanent spot in your baking rotation.