Pumpkin S'mores Bars Recipe tastes like a campfire s’more collided with a slice of pumpkin pie in the best way possible, with gooey marshmallows, melty chocolate, and spiced pumpkin all on a buttery graham crust. This recipe works well for fall parties, bake sales, or weeknight treats, and you can finish a batch in about 1 hour including cooling. I tested these while my kids “taste-tested” half the pan, so I feel pretty bonded to this one.

Why Make This Pumpkin S'mores Bars Recipe at Home

You control the spice level, sweetness, and chocolate-to-marshmallow ratio, which matters a lot with a rich dessert like this. Homemade bars also skip weird preservatives and use pantry ingredients you probably already keep around in fall.

You slice these pumpkin s’mores bars neatly, pack them for potlucks, and reheat them for that gooey marshmallow pull. They taste like a campfire treat but bake in a regular oven, so no one needs to smell like smoke.

“These Pumpkin S'mores Bars disappeared in ten minutes at our neighborhood potluck, and everyone asked for the recipe. ★★★★★”

Ingredients You Need

For the graham cracker crust

2 cups graham cracker crumbs
- Use about 14 full sheets; I like Honey Maid for consistent texture, but any plain graham cracker works.
- Swap in gluten free graham crackers if needed and pulse them very fine.
10 tablespoons unsalted butter, melted
- Salted butter works too; just reduce added salt in the filling slightly.
3 tablespoons brown sugar, packed
1/4 teaspoon fine sea salt

For the pumpkin layer

1 cup pumpkin puree
- Use 100% pumpkin, not pumpkin pie mix. Libby’s gives a thick texture that holds shape.
1/2 cup brown sugar, packed
1/4 cup granulated sugar
1 large egg
1 large egg yolk
1 teaspoon vanilla extract
1 teaspoon ground cinnamon
1/2 teaspoon ground ginger
1/4 teaspoon ground nutmeg
1/8 teaspoon ground cloves
1/2 teaspoon fine sea salt
2 tablespoons all purpose flour
- Use a 1:1 gluten free flour blend if you need a gluten free version.

For the chocolate and marshmallow topping

1 1/4 cups semi sweet chocolate chips
- Use mini chips if you want more even chocolate coverage.
- Milk chocolate chips give a sweeter, more classic s’mores vibe.
2 cups mini marshmallows
- Mini size melts and toasts more evenly than large ones.
2 graham crackers, roughly broken into small pieces, optional garnish

Equipment

8-by-8 inch baking pan or 9-by-9 inch baking pan
- An 8-inch pan gives slightly thicker bars; a 9-inch pan bakes a bit faster.
Parchment paper
Mixing bowls
Whisk and rubber spatula
Measuring cups and spoons
Food processor or zip-top bag and rolling pin for graham crumbs

Tips & Mistakes

Line the pan with parchment and leave an overhang so you lift the bars out easily without crumbling the crust.
Pack the graham crust firmly with the bottom of a measuring cup so it bakes into a solid base instead of a sandy layer.
Use room temperature egg and pumpkin so the filling mixes smoothly and bakes evenly.
Avoid pumpkin pie filling; it already contains sugar and spices and throws off the texture.
Do not overbake the pumpkin layer; pull it when the center barely jiggles so it stays creamy.
Add marshmallows near the end of baking so they toast golden instead of burning.
Cool the bars at least 30 minutes before slicing so the layers set and cut cleanly.
Use a hot, clean knife for each cut if you want bakery-style squares without marshmallow strings everywhere.

How to Make Pumpkin S'mores Bars Recipe

Step 1: Mix and bake the graham crust

Preheat the oven to 350°F and line your pan with parchment, leaving a little overhang on two sides. Stir graham cracker crumbs, brown sugar, and salt in a bowl, then pour in melted butter and mix until the crumbs feel like wet sand. Press the mixture firmly into the bottom of the pan in an even layer.

Bake the crust for 8 to 10 minutes until it smells toasty and looks slightly darker around the edges. Set the pan on a rack while you mix the pumpkin filling.

Step 2: Whisk the pumpkin filling

In a medium bowl, whisk pumpkin puree, brown sugar, granulated sugar, egg, egg yolk, and vanilla until the mixture looks smooth and glossy. Add cinnamon, ginger, nutmeg, cloves, and salt, then whisk again so the spices distribute evenly. Sprinkle the flour over the top and whisk just until no dry streaks remain.

Taste a tiny bit of the filling and adjust spices to your preference, adding a pinch more cinnamon or ginger if you like a stronger pumpkin spice flavor. Do not overmix at this stage so the filling stays tender.

Step 3: Bake the pumpkin layer

Pour the pumpkin mixture over the warm crust and spread it into an even layer with a spatula. Tap the pan gently on the counter to pop any air bubbles. Slide the pan into the oven and bake for 18 to 22 minutes, until the edges look set and the center still has a slight jiggle.

If you use a 9-inch pan, start checking at 16 minutes since the thinner layer bakes faster. Keep the oven on because you still need to toast the marshmallows.

Step 4: Add chocolate and marshmallows

Remove the pan from the oven and scatter chocolate chips evenly over the hot pumpkin layer. Wait 2 to 3 minutes so the chocolate softens, then sprinkle mini marshmallows over the top in a thick, even layer. Gently press the marshmallows so they stick to the soft chocolate and pumpkin.

Return the pan to the oven and bake 6 to 8 minutes, until the marshmallows puff and turn golden on top. If you want deeper color, switch the oven to broil on low and toast 30 to 60 seconds, watching closely so the marshmallows do not burn.

Step 5: Cool, garnish, and slice

Set the pan on a cooling rack and let the bars cool at least 30 to 45 minutes. While they cool, sprinkle broken graham cracker pieces over the warm marshmallows if you want extra crunch and that classic s’mores look. Once the pan feels just slightly warm, lift the slab out with the parchment.

Use a sharp knife to cut into 9 large bars or 16 smaller bars. Wipe the knife between cuts for clean edges and less marshmallow drag.

Variations I've Tried

I swapped semi sweet chocolate chips for dark chocolate chunks and loved the slightly less sweet, more grown-up flavor. I also tried a swirl of Nutella under the marshmallows, which tasted amazing but made the bars richer, so I cut them smaller. A version with crushed pretzels mixed into the crust gave a salty crunch that balanced the sweet topping nicely.

I tested a white chocolate chip version with extra cinnamon and it tasted like a pumpkin snickerdoodle s’more. You can also add a handful of chopped pecans over the pumpkin layer before the chocolate for a nutty twist that fits fall flavors.

How to Serve Pumpkin S'mores Bars Recipe

Serve Pumpkin S'mores Bars slightly warm so the chocolate softens and the marshmallows stay gooey. If you bake them ahead, warm each bar in the microwave for 10 to 15 seconds before serving. Pair them with cold milk, hot cocoa, chai, or a mug of black coffee to cut the sweetness a bit.

These bars travel well for potlucks, game nights, and school events, and you can slice them into bite-size squares for dessert platters. I also like to pack a small square in lunchboxes as a surprise treat.

How to store

Store cooled bars in an airtight container at room temperature for up to 2 days.
Keep them in the fridge for up to 5 days if your kitchen runs warm; let them sit at room temp 15 minutes before serving or warm briefly in the microwave.
Freeze individual bars on a parchment-lined tray until solid, then wrap each piece and store in a freezer bag for up to 2 months.
Thaw frozen bars in the fridge overnight, then reheat in a 300°F oven for 8 to 10 minutes or in the microwave in short bursts until the marshmallows soften again.