These s'mores brownies from brownie mix have graham cracker pieces in the batter and a topping of toasted marshmallows and chocolate.
You get the chocolate, graham crackers, and gooey marshmallows without building a campfire!
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Ingredients You'll Need
For the brownie base
Extra ingredients
Notes and Substitutions
- Brownie mix: Use a regular-size (about 18 ounces) boxed brownie. Any brand works.
- Water: You can use the same amount of milk, buttermilk, or cooled brewed coffee instead.
- Instant coffee: Optional, for a stronger chocolate taste. Leave it out if you're using brewed coffee.
- Graham crackers: Break them into small pieces. Mix most into the batter and save the rest for topping.
- Marshmallows: Mini marshmallows are easy to spread over the brownies. Cut larger ones into smaller pieces.
- Chocolate: Use your favorite milk or dark chocolate bar, broken into pieces.
How to Make S'mores Brownies
Preheat the oven to the temperature listed on the brownie mix box.
Grease a 9×9-inch baking pan and line it with parchment paper.
Trim any paper sticking above the pan so it won't be exposed to the broiler.
Step 1: Make the brownie batter
Prepare 1 box brownie mix with the eggs, water, and oil listed on the package.
Mix in ½ teaspoon instant coffee (or ¼ teaspoon espresso powder), if using.
Break 8 graham crackers into small pieces.
Add about ⅓ of the pieces into the batter. Save the rest for topping.
Step 2: Fill the pan
Spread the batter evenly in the prepared pan.
Step 3: Bake the brownies
Bake according to the package directions for a 9×9-inch pan. Start checking a few minutes early.
A toothpick inserted near the center should come out with a few moist crumbs and no wet batter.
Step 4: Add the topping
Scatter 2 cups marshmallows and the remaining graham cracker pieces over the baked brownies.
Broil on low for about 2 minutes, until the marshmallows are lightly golden. Watch closely because they can burn quickly.
Remove from the oven. While the topping is hot, add 1 chocolate bar, broken into pieces.
Step 5: Cool and cut
Let the brownies cool completely in the pan.
Refrigerate for at least 1 hour before cutting if you want neater slices.
Recipe FAQs
Milk chocolate gives them the familiar s'mores taste. Dark chocolate works too if you prefer something less sweet.
They may have been too close to the broiler or left under it too long. Use the low setting and watch the whole time. Remove the pan as soon as they're lightly golden.
Yes. Make them the day before and keep them covered in the refrigerator once cooled. The graham crackers will be softer, but you'll still have the chocolate and marshmallow topping.
For more tips and answers to common questions, see my guide to boxed brownies.
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📖 Recipe
S'mores Brownies (From Brownie Mix)
Equipment
- 9x9-inch pan
Ingredients
- 1 box brownie mix (about 18 ounces)
- Eggs as directed on the box
- Water as directed on the box
- Neutral oil as directed on the box
- ½ teaspoon instant coffee (or ¼ teaspoon espresso powder) optional
- 8 graham crackers broken into pieces, divided
- 2 cups mini marshmallows
- 1 chocolate bar broken into pieces
Instructions
- Preheat the oven as directed on the box. Grease a 9×9-inch metal pan and line with parchment. Trim paper extending above the pan before broiling.
- Prepare the brownie batter with the eggs, water, and oil listed on the box. Add the instant coffee, if using.
- Add about ⅓ of the graham cracker pieces. Spread the batter evenly in the pan.
- Bake according to the package directions. A toothpick near the center should come out with moist crumbs and no wet batter.
- Add the marshmallows and remaining graham crackers on top. Broil on low for about 2 minutes, until lightly golden. Watch closely.
- Remove from the oven and add the chocolate pieces while the topping is hot.
- Cool completely. Refrigerate for at least 1 hour before cutting for neater slices.
Video
Notes
- Brownie mix: Use an 18-ounce box of any brand.
- Water: Substitute the same amount of milk, buttermilk, or cooled coffee.
- Instant coffee: Optional. Skip if using brewed coffee.
- Graham crackers: Break into pieces. Save some for topping.
- Marshmallows: Use mini marshmallows or cut larger ones into pieces.
- Chocolate: Use milk or dark chocolate, broken into pieces.
Gwen says
Can I use marshmallow fluff instead of mini marshmallows?
Nora Reyes says
Hi Gwen! Yes, you can, but it works a little differently. Marshmallow fluff melts much faster and spreads, so it’s best to dollop it on top during the last few minutes of baking or swirl it in gently, rather than adding it from the start. Mini marshmallows hold their shape better, but fluff will still give you that gooey marshmallow layer. 😊😊😊
Jen says
Wow! This is mouthwatering!
Nora Rey says
Thank you! 😊 If you decide to try them out, I hope you enjoy every bite! Feel free to reach out anytime if you need help.