S’mores Brownies

These S’mores Brownies are what happens when a campfire favorite meets a fudgy, chocolate-loaded dessert. With layers of graham crackers, gooey brownies, and toasted marshmallows, they’re easy to make and even easier to disappear.

S’mores have clearly become a bit of a thing around here. Between my Mini S’more Pies, S’mores Cookies, S’mores Dip, and S’mores Pops, it’s safe to say I’m not running out of ways to keep that chocolate-marshmallow combo going anytime soon.

Why You’ll Love These S’mores Brownies

• Starts with a boxed mix → quick and easy
• Layers of graham cracker, brownie, and toasted marshmallow
• Gooey, chocolatey, and just messy enough to feel fun
• Perfect for summer, potlucks, or anytime you want a crowd-pleaser

Cetcu tip: Corner pieces always have the best marshmallow situation.

What You’ll Need

• Brownie mix (plus ingredients listed on the box)
• Graham crackers
• Mini marshmallows
• Chocolate candy bar

How to Make S’mores Brownies

1. Prep the pan & batter
Grease or line an 8×8 pan and prepare the brownie mix according to the package.
2. Build the base
Arrange graham crackers in the bottom of the pan, then pour the brownie batter over the top.

3. Bake
Bake just until set in the center—slightly underbaked is perfect.

4. Add topping & broil
Top with marshmallows and graham cracker pieces, then broil until marshmallows are golden and puffy (watch closely!).

5. Finish & cool
Sprinkle chopped chocolate over the warm brownies so it melts, then let cool before slicing.

Cetcu tip: Spray your knife lightly before slicing to keep the marshmallow from sticking.

Tips for the Best S’mores Brownies

• Use a metal pan → it bakes more evenly and prevents overbaked edges
• Don’t overbake → fudgy is what you want
• Mini marshmallows melt and toast more evenly
• Keep a close eye under the broiler—it happens fast

Cetcu tip: Turn on the oven light and stay close—this is not the moment to walk away.

Storage

Store brownies in an airtight container:

• Room temperature: 3–4 days
• Refrigerator: up to 5–6 days

Freezing

Wrap individually or separate layers with parchment so they don’t stick.
Thaw overnight in the refrigerator.

Frequently Asked Questions

Can I use a different brownie mix?

Yes—any brand will work, just stick with an 18-ounce box for best results.

Do I have to use the chocolate bar?

No, but it adds an extra layer of melty chocolate that really takes these over the top.

Can I use a glass baking dish?

You can, but a metal pan is best. Glass holds heat longer and can lead to overbaked edges, so you may need to adjust the bake time slightly.

Why are my brownies sticking when I cut them?

Make sure they’re fully cooled before slicing, and lightly spray your knife for cleaner cuts.

Final Thoughts

These S’mores Brownies bring all the nostalgia of a campfire treat into an easy, bake-and-share dessert. Rich, gooey, and layered with texture, they’re the kind of recipe people ask for after one bite.

S'mores Brownies

Yield: 9 brownies
Prep Time: 10 minutes
Bake Time: 35 minutes
Total Time: 45 minutes

Easy S’mores Brownies made with a boxed mix, layered with graham crackers, gooey marshmallows, and melted chocolate for a nostalgic, crowd-pleasing dessert.

Ingredients

• 18 ounce boxed brownie mix (I use Ghirardelli)
• 1/3 cup vegetable oil ,use quantity listed on box
• 1/3 cup water ,use quantity listed on box
• 1 large egg, room temp ,use quantity listed on box
• 2 graham cracker sheets
• 3 ounce chocolate bars, chopped , use as much chocolate to your liking
• 2 cups mini marshmallows

Instructions

1. Preheat your oven to 350°F and spray an 8x8 baking pan with nonstick cooking spray or line with parchment paper.
2. Prepare the brownie mix according to the box instructions, then set it aside.
3. Line the bottom of the prepared baking pan with graham crackers. You may have to break some of them to make them fit.
4. Pour the prepared brownie mix over the top.
5. Bake for 33-35 minutes.
6. Remove the brownies (they won’t be done baking yet) and turn the oven to broil.
7. Top the under-baked brownies with marshmallows and graham cracker pieces.
8. Broil for 1-2 minutes just until the marshmallows turn a light golden brown and start to expand.
9. Remove the brownies from the oven and sprinkle them with the chopped chocolate bar. It will melt from the heat of the brownies.
10. Allow them to cool for at least 1 hour before cutting into pieces and serving.

Notes

Tips

• Slightly underbake for a soft, fudgy texture.
• Use a metal pan for more even baking.
• Watch closely while broiling—marshmallows brown quickly.

Storage

Store in an airtight container at room temperature for up to 4 days or refrigerate for up to 6 days.

Freezing

Wrap individually or layer with parchment. Thaw overnight in the refrigerator.

Nutrition Information:

Yield: 9
Serving Size: 1

Amount Per Serving: Calories: 340
Total Fat: 13g
Saturated Fat: 4g
Unsaturated Fat: 9g
Cholesterol: 24mg
Sodium: 196mg
Carbohydrates: 53g
Fiber: 1g
Sugar: 9g
Protein: 4g

Nutrition information is estimated based on the ingredients and cooking instructions as described in each recipe and is intended to be used for informational purposes only. Please note that nutrition details may vary based on methods of preparation, origin, and freshness of ingredients used and are just estimates. We encourage, especially if these numbers are important to you, to calculate these on your own for most accurate results.