S’mores brownies are a classic combination of marshmallow, chocolate and graham crackers made with your favorite box of brownie mix for an irresistible dessert!

toasted gooey marshmallow on top of s'more brownies


Is there anything better than a s’more? In my humble opinion, it’s almost dessert perfection. Almost. The only thing that can make it better? Adding the toasted marshmallows and graham crackers to brownies.

Plus this easy dessert recipe means you don’t need a campfire to enjoy the flavor combination so you can indulge in the summer and fall treat year round!

We love taking a boxed brownie mix and making it something special. If you like these give our Pecan Pie Brownies, Brookies, and Pecan Pie Cheesecake Brownies a try!

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toasted marshmallows on top of s'more brownies

What You’ll Need

To make gooey sweets, get these ingredients out:

  • Brownie mix – Pick your favorite and go. Also, don’t forget to have on hand the ingredients needed for the box mix.
  • Graham crackers – We normally use plain graham crackers to make this recipe, but you could use the cinnamon sugar coated or other varieties if they float your boat. 
  • Marshmallows – We go for the larger size marshmallows and cut them in half for this recipe You could use the mini-marshmallows if you want, just don’t cut them in half. You could also get the flat marshmallows that are made for making s’mores if you can find them at your store. Again, just don’t cut those in half.
Step-by-step instructions for making S'mores brownies

How to Make It

Prepare the brownie mix. In a medium sized mixing bowl, prepare the brownie mix according to the box instructions. If you have a homemade brownie recipe, you can follow that instead. Once it is prepared, set it aside for a minute.

Layer the brownies. On the bottom of a well greased brownie pan, lay a single layer of graham crackers across the bottom. Pour half of the brownie mixture over the layer of graham crackers. Next, lay another layer of graham crackers and then pour the remaining batter over the second layer of brownie mix.

Bake the brownies. Follow the brownie box’s instructions for baking the brownies. Be sure to preheat your oven, often brownies cook around 325 or 350 depending on the recipe. Once the brownies have finished baking, remove them from the oven.

Finish with marshmallows. When the brownies are still hot from the oven, carefully arrange the halved marshmallows over the top of the brownies. Switch your oven to broil. Place the brownie pan under the broiler for about 2 to 3 minutes or until they have started to brown and are melty. 

Remove from the broiler and allow them to cool for a few minutes before cutting and enjoying!

s'more brownies with toasted marshmallows

Tips for Making S’mores Brownies 

  • Before cutting the brownies, lightly grease your knife with oil or with a non-stick spray. This will help keep the brownies and marshmallows from sticking to the knife.
  • Use different flavored graham crackers for a slightly different flavor. For extra chocolate, try chocolate flavored graham crackers. Or to spice things up a bit, try them with cinnamon sugar coated graham crackers.
  • You can skip the second layer of graham crackers if you prefer. I love the graham cracker flavor, but Melinda prefers to use only one and keep it a bit less messy. Either way works great!
  • Keep a close eye on the brownies when they are under the broiler. Browned marshmallows can quickly burn in a blink of the eye.
  • Don’t bake the marshmallows from the start. You may think you’re saving a step by adding the marshmallows on top before baking. This is a big no no. The marshmallows will over cook and become hard and not very tasty.
gooey marshmallow s'more brownies
What Size Marshmallow Should I Use?

For this recipe, we use regular sized marshmallows that we cut in half width-wise. We then place them on top of the freshly baked brownies. If you want to use mini-marshmallows, you definitely can. Just spread them out evenly in a single layer. 

Also, you can use the flat marshmallows made for s’mores. Just spread them in a single layer over the brownies too. No need to cut them in half.

What Happens If you Bake Marshmallows?

When you bake marshmallows they first begin to puff up and then they begin to brown. Once the browning begins you need to keep a careful eye on them because they will go from perfectly toasted marshmallows to burnt in the blink of an eye. 

This is why we use the broiler to toast them up nicely at the end. If you add marshmallows at the beginning of the baking they will puff, brown, and then become very unappetizing by the time the brownies are fully cooked.

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Servings: 20
Prep Time: 10 minutes
Cook Time: 30 minutes
Total Time: 40 minutes

S’mores Brownies Recipe

This simple s'mores brownie recipe is a quick and easy way to make s'mores without the campfire and the mess. Boxed brownie mix is layered with graham crackers and topped with toasted marshmallows for the ultimate s'mores.
toasted gooey marshmallow on top of s'more brownies
Print Recipe
4.42 from 12 votes


  • 1 box Brownie mix, + ingredients needed to make brownies
  • 14 Graham crackers
  • 18 Marshmallows, cut in half


  • Follow the instructions on your brownie mix box to make your brownie mixture
  • Lay 1 layer of graham crackers over the bottom of the dish.
  • Pour half of the brownie mixture over the graham crackers
  • Lay another layer of graham crackers over the brownie mix.
  • Pour the remaining brownie mixture over the graham crackers
  • Bake according to brownie package instructions.
  • Remove from oven and place the halved marshmallows over the top of the brownies. Place back in oven and BROIL for 2-3 minutes or until marshmallows are melted and brown. 
  • Remove from oven and enjoy!


Note: We are not nutritionists. Nutritional information is generated using online databases. Use as a guide only. 


Serving: 1brownie, Calories: 174kcal, Carbohydrates: 32g, Protein: 2g, Fat: 4g, Sodium: 144mg, Potassium: 17mg, Sugar: 18g, Calcium: 8mg, Iron: 1.1mg
Nutrition Disclaimer: We are not certified nutritionists. Nutrition facts are an estimate and are provided as a courtesy. They are generated by an online API which recognizes ingredient names and amounts and makes calculations based on the serving size. Results may vary.
Author: Kat Jeter
Course: Dessert
Cuisine: American
Keyword: brownie, brownie recipe, chocolate, graham cracker, s’mores
Handwritten signature for Kat & Melinda