I’m obsessed with the gooey dance of a s’more and the fudgy backbone of a brownie. Put them together and you get S’mores Brownies, the ultimate gooey summer cookout treat. No fluff, just rich chocolate, marshmallow pull, and a graham crackle that actually stays crisp when the sun bakes the yard. Ready to bake and glow?
Meet the S’mores Brownies Ultimate Gooey Summer
There’s something magical about the contrast: dense brownie anchor, melting marshmallow hail, and toasty graham bits. This isn’t dessert for a formal dinner party; it’s the snack you make with friends buzzing in the background, burgers sizzling, and a playlist that’s equal parts nostalgia and summer heat. FYI, you’ll want a big plate nearby because the slices disappear fast.
What Makes These Brownies Special
– They stay fudgy inside with a crispy, crackly top.
– The marshmallow swirl pockets stay gooey rather than turning into a dessert-in-a-bar brick.
– You can customize with extra mix-ins like peanut butter chips or crushed cookies.
– Make-ahead friendly and easy to transport to a park or potluck.
Texture cues to aim for
– Edges are slightly set and pull away from the pan a touch.
– The center gives a soft jiggle when you tap the pan, not a wobble.
– When cooled, a clean cut should reveal glossy chocolate and visible marshmallow ribbons.
– The top crackle should be matte and shattery, not shiny and wet.
The Recipe in One Breath: Ingredients and Prep
This is a well-loved riff on classic brownies with a marshmallow twist. Gather:
- 1 cup (2 sticks) unsalted butter
- 2 cups granulated sugar
- 4 large eggs
- 1 teaspoon vanilla extract
- 1 cup all-purpose flour
- 3/4 cup unsweetened cocoa powder
- 1/2 teaspoon salt
- 1 cup semisweet chocolate chips
- 1 1/2 cups mini marshmallows
- 1 cup graham cracker crumbs or broken graham crackers
Helpful tips
– If you don’t have graham crackers, honey maid crushed cookies or even crushed pretzels can add a fun crunch.
– Use a light-colored metal pan for even baking and visible edges.
Step by Step: Baking Instructions
- Preheat oven to 350°F (175°C). Lightly grease a 9×13 inch pan and line with parchment for easy removal.
- Melt butter in a saucepan until glossy. Remove from heat and whisk in sugar until silky.
- Beat in eggs one at a time, then whisk in vanilla. Don’t rush this; the batter should look glossy and thick.
- Sift together flour, cocoa powder, and salt. Fold into the wet mixture until just combined.
- Stir in chocolate chips and graham cracker crumbs. Pour half the batter into the pan and spread evenly.
- Scatter mini marshmallows in an even layer, then dollop the remaining brownie batter on top. Use a spatula to swirl slightly for ribbons, not a marble effect.
- Bake 28-32 minutes, until the edges pull away and the center has a gentle jiggle. Don’t overbake or you’ll lose the gooey charm.
- Let brownies cool completely, then finish with a light sprinkle of extra graham cracker crumbs for crunch. Slice into neat squares and serve.
Visual cues for doneness
– The edges are set and pull away from the pan just a touch.
– The center jiggles when you gently shake the pan, but not like liquid.
– A toothpick inserted near the edge should come out with a few moist crumbs, not wet batter.
– The surface should have a glossy, crackly shell, not dull or sunken.
Make-Ahead and Storage: Keep the Gooey Going
- Make ahead: Bake through the full process, then cover and refrigerate for up to 3 days. Rewarm in a 300°F oven for 8-10 minutes to revive the goo.
- Freezer tip: Slice first, then freeze individual bars on a sheet pan. Once frozen, wrap and store in a zip-top bag for up to 2 months. Thaw at room temp or warm gently.
- Storage tips: Store in airtight container at room temp for 2-3 days; refrigerate for up to 5 days. Bring back to room temp to regain softness before serving.
Why refrigeration helps or hurts
– Chill makes the chocolate denser and easier to stack for a picnic.
– Too cold and the marshmallow layer stiffens; the magic softens again once warmed.
– IMO a slight re-warm in the microwave or oven makes the marshmallows extra gooey, but watch the edges.
Flavor Tweaks and Substitutions
- Nut-free option: Use only dairy-free butter or oil and ensure chocolate is dairy-free if needed.
- Peanut butter twist: Add a swirl of creamy peanut butter into the batter before layering for a salty-sweet kick.
- Different chocolate: Mix dark and milk chocolate chips for a nuanced bite. FYI, the deeper chocolate can intensify the marshmallow sweetness.
- Gluten-free: Use a 1:1 gluten-free flour blend. Expect a slightly crumblier texture, still deliciously gooey.
How to handle substitutions without losing texture
– Don’t skip the eggs; they emulsify moisture and give structure. If needed, try an egg substitute that matches the count, but add an extra tablespoon of oil to preserve moisture.
– If marshmallows seem overwhelmed, scatter a few more on top during the last 5 minutes of bake to re-melt them into the surface.
Serving Ideas: Elevate the Moment
- Pair with a scoop of vanilla bean ice cream for a classic hot-cold contrast.
- Drizzle with a thin caramel or chocolate sauce and a pinch of flaky salt for a grown-up finish.
- Cut into bars and top with chocolate-covered graham crackers for a textured crunch bite.
Presentation tips for social media worthy shelves
– Slice evenly and arrange in a neat row on a rustic board.
– Dust with a tiny pinch of powdered sugar and a few graham cracker crumbles for contrast.
– Capture a close-up of the gooey center with marshmallow pull to tease the texture.
Common Pitfalls and Quick Fixes
- If the top stays flat and dull, bake a bit longer with 2-3 minutes of extra bake time, watching closely. A slightly crackled top is your friend.
- If the center is underdone, bake a few minutes more but rotate the pan halfway to ensure even cooking.
- If the brownies taste flat, check the salt amount. A touch more salt can brighten chocolate flavors and bring out the marshmallow sweetness.
FAQ: Your Quick Answers
Can I use a different pan size?
A 9×13 inch pan is ideal for a thick, fudgy result. If you use a larger pan, the bake time drops, and the bars become thinner. For thicker slabs, stick with the 9×13 and adjust bake time by 3-5 minutes, checking for doneness with the jiggle test.
Is this a make ahead dessert?
Yes, these brownies are friendly to make ahead. Bake, cool, and store in the fridge up to 3 days or freeze for longer storage. Reheat gently to revive the gooey center. IMO reheating in a 350°F oven for 8-10 minutes works wonders.
What about substitutions for dietary needs?
Use dairy-free butter and dairy-free chocolate for a dairy-free version. To keep the marshmallow texture, check marshmallow ingredients to ensure they’re gelatin-based and non-dairy if needed. For gluten-free, use a 1:1 gluten-free flour blend and ensure graham crackers are gluten-free.
How do I store leftovers?
Keep leftovers in an airtight container at room temperature for 2-3 days. Refrigerate for up to 5 days. For longer storage, freeze slices individually and reheat as needed.
Can I add extra toppings?
Yes, texture loves texture. Add roasted nuts for crunch, crushed pretzels for a salty bite, or a drizzle of caramel for a glossy finish. Just don’t overload the surface or it’ll drown the gooey center.
Conclusion: Your Summer S’mores Brownies Moment
If you want a dessert that nails both the nostalgia of campfire nights and the decadence of a brownie, this S’mores Brownies recipe is your go-to. It’s a breezy bake, a crowd-pleaser, and a treat that travels well to any summer gathering. So preheat, swirl some marshmallows, and let the kitchen become a little campsite in your home. The gooey magic is waiting, and you deserve the best sweet treat of the season. IMO, you’ll be reaching for seconds before your friends even blink.
Recipe Card
S’mores Brownies Ultimate Gooey Summer
Dense fudgy brownies layered with marshmallows and graham crumbs for a gooey, campfire inspired treat perfect for summer cookouts.
- Prep Time: 15 minutes
- Cook Time: 28-32 minutes
- Total Time: 1 hour
- Servings: 12
Ingredients
- 1 cup (2 sticks) unsalted butter
- 2 cups granulated sugar
- 4 large eggs
- 1 teaspoon vanilla extract
- 1 cup all-purpose flour
- 3/4 cup unsweetened cocoa powder
- 1/2 teaspoon salt
- 1 cup semisweet chocolate chips
- 1 1/2 cups mini marshmallows
- 1 cup graham cracker crumbs or broken graham crackers
Instructions
- Preheat oven to 350°F and prepare a 9×13 inch pan.
- Melt butter, whisk in sugar, then add eggs and vanilla until glossy.
- Stir in sifted flour, cocoa, and salt just until combined.
- Fold in chocolate chips and graham crumbs. Layer half in pan, add marshmallows, then top with remaining batter. Swirl gently.
- Bake 28-32 minutes until edges pull away and center jiggles softly. Cool completely before slicing.
Notes
For extra goo, rewarm slices in a 300°F oven for a few minutes. Customize with peanut butter swirls or extra crunch from nuts or cookies.

