S'mores Brownies are one of those recipes that instantly impresses anyone who tries them. They're fudgy, chocolatey, and loaded with all the nostalgic flavors of a classic campfire s'more—yet they're made in your own kitchen without needing a fire pit or roasting sticks.
This recipe is perfect if you're a chocolate lover, a s'mores enthusiast, or someone who enjoys crowd-pleasing desserts. Even better, it requires just one bowl for the brownie base and simple layering, making it ideal for potlucks, family gatherings, or weekend baking projects.
In this post, you'll learn everything you need to know—from ingredients to step-by-step instructions and helpful tips for the best results.
Why Graham Crackers Work in S'mores Brownies
Graham crackers are essential to this recipe because they provide the authentic s'mores foundation and add a delightful crunch that contrasts beautifully with the fudgy brownie layer.
When incorporated correctly, they become:
- A sturdy base that holds the brownie layer
- A source of honey-sweetened flavor and texture
- A nostalgic reminder of traditional campfire s'mores
- Naturally lower in fat than typical brownie crusts
This makes S'mores Brownies:
- A fun twist on classic brownies
- Baked in one pan for easy cleanup
- Ready in under an hour
- Customizable with your favorite chocolate brands
Ingredients You'll Need
Main Ingredients
**Graham crackers (about 10-12 sheets)**
These form the crust layer and provide that signature s'mores taste. Use honey graham crackers for the most authentic flavor.
**Unsalted butter (1 cup or 2 sticks)**
Creates richness in the brownie layer and helps bind the graham cracker crust. Using unsalted allows you to control the saltiness.
**Granulated sugar (1½ cups)**
Sweetens the brownies and helps create that crackly top texture we all love.
**Cocoa powder (¾ cup)**
Use high-quality unsweetened cocoa powder for deep chocolate flavor. Dutch-process cocoa works beautifully here.
**All-purpose flour (1 cup)**
Provides structure without making the brownies cakey. Don't overmix once you add the flour.
**Eggs (4 large)**
These bind everything together and contribute to the fudgy texture. Room temperature eggs mix more smoothly.
**Vanilla extract (2 teaspoons)**
Enhances all the chocolate flavors and adds warmth.
**Salt (½ teaspoon)**
Balances the sweetness and intensifies the chocolate taste.
**Mini marshmallows (2-3 cups)**
The star of the s'mores experience! Mini marshmallows toast more evenly than large ones.
**Chocolate chips (1½ cups)**
Semi-sweet or milk chocolate chips add pockets of melty chocolate throughout. You can also use chopped chocolate bars.
Optional Add-Ins
- **Extra chocolate bars** broken into squares for more dramatic chocolate chunks
- **Sea salt flakes** for sprinkling on top before baking
- **Espresso powder** (1 teaspoon) to deepen the chocolate flavor
Step-by-Step Instructions
Preheat your oven to 350°F (175°C). Line a 9x13-inch baking pan with parchment paper, leaving some overhang on the sides for easy removal later. Lightly grease the parchment with butter or cooking spray.
**Tip:** The parchment paper overhang acts as handles, making it much easier to lift the brownies out for clean cutting.
Step 2: Create the Graham Cracker Layer
Arrange graham crackers in a single layer across the bottom of your prepared pan. You may need to break some crackers to fit the edges. Press them down gently so they're snug but not overlapping too much.
**Tip:** Don't worry if there are small gaps—the brownie batter will fill them in.
Step 3: Make the Brownie Batter
In a large microwave-safe bowl, melt the butter completely (about 60-90 seconds). Stir in the sugar until well combined. Let this mixture cool for about 5 minutes—you don't want to cook the eggs when you add them.
Add the eggs one at a time, whisking well after each addition. Stir in the vanilla extract. The mixture should look glossy and smooth.
Step 4: Add Dry Ingredients
Sift together the cocoa powder, flour, and salt directly into the wet ingredients. Gently fold everything together using a rubber spatula until just combined. You should see no dry streaks, but don't overmix—this keeps the brownies fudgy instead of cakey.
Fold in 1 cup of chocolate chips, reserving the rest for topping.
Step 5: Pour and Spread
Pour the brownie batter over the graham cracker layer, spreading it evenly to all corners with your spatula. Tap the pan gently on the counter a few times to release any air bubbles and help the batter settle into the gaps.
Step 6: Bake the Brownie Base
Place the pan in your preheated oven and bake for 25-30 minutes. You're looking for the brownies to be mostly set but still slightly underdone in the center—a toothpick inserted should come out with a few moist crumbs.
**Tip:** Don't overbake at this stage since the brownies will continue baking with the marshmallow topping.
Step 7: Add the S'mores Toppings
Remove the pan from the oven and immediately scatter the mini marshmallows evenly across the top. Sprinkle the remaining chocolate chips over and between the marshmallows.
Return the pan to the oven and bake for an additional 8-12 minutes, until the marshmallows are puffed, golden, and toasted on top. For extra toasting, you can turn on the broiler for the last 1-2 minutes, but watch carefully to prevent burning.
Step 8: Cool Completely
This is the hardest step—waiting! Let the S'mores Brownies cool in the pan for at least 1 hour at room temperature. For the cleanest cuts, refrigerate for another 30-60 minutes before slicing.
Use the parchment paper overhang to lift the entire brownie slab onto a cutting board, then cut into squares with a sharp knife, wiping it clean between cuts.
Serving Ideas
You can enjoy S'mores Brownies on their own (they're already a complete dessert!), or serve them with:
- Vanilla ice cream for an à la mode experience
- Hot fudge or chocolate sauce drizzled on top
- A dollop of whipped cream
- Fresh strawberries for a fruity contrast
- A sprinkle of crushed graham crackers for extra crunch
For a more polished look, serve on individual dessert plates with a dusting of cocoa powder.
Tips for the Best Results
- **Use fresh marshmallows** for the best puff and texture—stale marshmallows won't toast as nicely
- **Don't skip the cooling time**—warm brownies will be too gooey to cut cleanly, and cooling allows all the layers to set properly
- **Watch the marshmallows carefully** during the final bake, especially if using the broiler, as they can go from perfectly golden to burnt in seconds
- **Let eggs and butter come to room temperature** before mixing for a smoother batter
- **Serve within 2 days for best texture**—the marshmallows will remain soft and the graham crackers will stay relatively crisp
Storage Instructions
Store leftover S'mores Brownies in an airtight container at room temperature for up to 2 days. The graham cracker layer will gradually soften as it absorbs moisture from the brownie layer, but they'll still taste delicious.
For longer storage, keep them in the refrigerator for up to 5 days. The texture will become more fudgy and firm when cold—some people actually prefer them this way!
This recipe is not recommended for freezing due to the marshmallow topping, which can become sticky and lose its texture when thawed. However, if you want to freeze them anyway, place individual brownies on a parchment-lined baking sheet, freeze until solid, then transfer to a freezer bag for up to 2 months.
Are S'mores Brownies Healthy?
While S'mores Brownies are definitely an indulgent dessert, they're made with simple, recognizable ingredients like butter, eggs, flour, and real chocolate—no artificial flavors or preservatives required.
They contain:
- Antioxidants from cocoa powder
- Energy from natural sugars and carbohydrates
Compared to store-bought brownies loaded with artificial ingredients, this homemade version allows you to control the quality of ingredients and portion sizes. Plus, the nostalgic joy of enjoying a s'more in brownie form is good for the soul!
These brownies are best enjoyed as an occasional treat rather than an everyday snack, but there's absolutely nothing wrong with savoring a homemade dessert made with quality ingredients.
Final Thoughts
S'mores Brownies prove that you don't need a campfire to enjoy the magic of s'mores. With just basic baking ingredients, graham crackers, marshmallows, and chocolate, this recipe transforms into something truly special that combines the best of both brownies and s'mores.
Whether you're a nostalgic millennial who grew up making s'mores at summer camp or a parent introducing your kids to this classic flavor combination, these brownies are definitely worth making. They're guaranteed to disappear quickly at any gathering, and you might find yourself making them on repeat all year long—no campfire required.