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Chocolate Marshmallow Cookies (Brownie Mix Cookies)

5 from 2 votes

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Chocolate marshmallow cookies are the perfect way to get your s’mores fix without having to build a campfire.

Using your favorite brownie mix as a shortcut is pure genius—you’ll get a cookie with a fudgy brownie texture studded with graham cracker pieces inside and an ooey gooey marshmallow on top. 

Picking up a chocolate marshmallow cookie from a platter of cookies, with a glass of milk in the background.

S’mores Cookies That Will Blow Your Mind

When I’m in the mood for a rich and decadant dessert, there’s nothing that hit the spot quite like the combination of chocolate and marshmallow. Those two ingredients are such a perfect pair.

These bakery-style chocolate marshmallow cookies are fudgy and rich, with a delicious s’mores flavor that will remind you of sitting around a fire and telling stories with your friends and family.

Starting with brownie mix is a great shortcut that makes this dessert so easy to make!

If you’re never had brownie mix cookies before, you’re in for a real treat. They’re crispy-on-the-outside, fudgy-on-the-inside, and a guaranteed crowd-pleaser. 

Pour yourself a big glass of milk, because these cookies are really rich! 

What you’ll love about this chocolate marshmallow cookie recipe

  • 5 Ingredient Recipe: Using brownie mix for the cookie base, means no need to soften butter or measure flour or baking soda. 
  • Perfect for chocolate lovers: These gooey cookies are sure to satisfy any chocolate craving 
  • A quick and easy dessert recipe the whole family will love!
Flat lay image of ingredients needed to make s'mores brownie mix cookies, including a box of Trader Joe's truffle brownie mix.

Marshmallow Brownie Cookie Ingredients

hese bownie mix cookies are so easy to make. You’ll need:

Brownie Mix. Use your favorite standard-size box of brownie mix — most will range from 16-19 ounces, depending on the brand. I made the cookies pictured here with Trader Joe’s mix, but I’ve also made this recipe with Ghiradelli and Dunken Hines mixes. 

Graham Crackers. We’ll crush them up and stir them into the batter to give these cookies an extra pop of classic s’mores flavor. 

Marshmallows. You have some options here. Go for big, fluffy marshmallows like I did, or opt for mini marshmallows. 


Vegetable Oil.


Mixing dry brownie mix in a bowl.
Brownie mix cookie dough.

How to make s’mores brownie cookies

First off, ignore the directions on the box of brownie mix. You won’t need those at all.

Empty the dry mix into a large mixing bowl and stir in the eggs, water, and oil to form a thick batter.

Next crush up your graham crackers and fold them into the batter. You want the graham cracker pieces to be about the size of a penny — small enough to be bite-sized, but not so pulverized that they’ll disappear into the batter

Scoop tablespoons of dough onto a baking sheet lined with parchment paper. The cookies will spread as they bake, so leave a little space between them. An inch or two is plenty. 

Top each cookie with either half of a large marshmallow or 2-4 mini marshmallows. Press them down into the dough a little to help them stick!

Bake for 10-12 minutes, or until the cookies are set and the marshmallows are lightly toasted and browned. 

Let the cookies cool completely before you taste them, since the marshmallows will be very hot! Don’t worry though, they’ll stay super soft and gooey even after they cool off. 

Stirring graham crackers into the dough to make s'mores cookies.
Topping each scooped brownie cookie with a marshmallow.

Expert tips and substitutions:

If you don’t have marshmallows, you can use a dollop of marshmallow fluff to top each cookie. It will get toasty and golden just like a marshmallow would! 

No cocoa powder? You can use flour instead. The cookies won’t be as rich, but they’ll still have plenty of chocolate flavor. 

If the marshmallows slide off the cookie while they bake, gently scootch them back on top using the back of a spoon. Don’t touch them with your fingers because they will be very hot! 

Using Ghirradelli mix or another mix that comes with a pouch of chocolate sauce? Go ahead and add it in.

If you brownie mix is too thin to scoop, add cocoa powder 1 teaspoon at a time until it has a scoop-able cookie dough texture. 

If your dough is thick, but sticky, let it sit for 5-10 minutes to allow the flour to hydrate. 

Make the dough ahead of time and freeze it in individual portions for cookies whenever you want! Thaw in the fridge over night and top marshmallows just before baking. Or cook them from frozen, adding the marshmallows after 2-3 minutes in the oven. 

Overhead view of chocolate marshmallow cookies hot from the oven - the marshmallows are lightly browned and toasted.

Frequently asked questions about chocolate marshmallow brownie mix cookies

Can you freeze marshmallow cookies?

I don’t like the texture of the marshmallows after they’ve been frozen, so I don’t recommend freezing these cookies after you’ve baked them. You can freeze the unbaked dough though and bake off a few cookies as you want to eat them. (I use my air fryer for this to make things super fast – no waiting for the oven to preheat!) 

Will the marshmallows melt in the oven?

The marshmallows will melt slightly, but will brown on top and shouldn’t turn into total goo. Just to be safe though, I do like to line my baking sheet with parchment paper and I make sure each marshmallow is snugly in place on top of the cookie dough before baking. 

What kind of brownie mix should I use?

You can use whatever your favorite mix is, as long as it’s a standard sized box, about 16-20 ounces. I’ve included some tips above on how to troubleshoot if your dough doesn’t seem quite right ,so be sure to check those out if you’re having problems. That said, I’ve made these with all sorts of brownie mixes — even mixed that include chocolate chips or syrup. 

How to store marshmallow cookies

This cookies will stay fresh and chewy in an airtight container at room temperature for 4-5 days (if you don’t eat them all before then!)

Other cookie recipes you might like:

A stack of chocolate marshmallow brownie cookies with a glass of milk.
overhead view of smores cookies.

Chocolate Marshmallow Cookies

These gooey chocolate and marshmallow cookies are a crowd favorite, perfect for any occasion! Using brownie mix is a great shortcut that gives them a rich and chewy texture you'll love.
5 from 2 votes
Prep Time 10 minutes
Cook Time 12 minutes
Cooling Time 15 minutes
Total Time 37 minutes
Course Dessert
Cuisine American
Servings 24 cookies
Calories 160 kcal


  • 1 box brownie mix
  • 2 large eggs
  • ½ cup vegetable oil
  • ¼ cup cocoa powder
  • 1 Tablespoon water
  • ½ cup lightly crushed graham crackers (about 6 squares)
  • 12 large marshmallows


  • Heat your oven to 350°F. Line two baking sheets with parchment paper.
  • In a mixing bowl, combine the brownie mix, eggs, oil, cocoa powder, and water to form a thick dough. Stir in the graham crackers.
  • Scoop tablespoons of dough onto your prepared cookie sheets, leaving 1-2 inches of space between each cookie.
  • Cut or tear each marshmallow in half. Place a marshmallow half on the top of each cookie, cut size down. Press gently into the dough to secure it.
  • Bake for 10-12 minutes, until the cookies are set and the marshmallows are slightly toasted. If you oven has hot spots, it's helpful to rotate the pans after 5 minutes so the marshmallows brown evenly.
  • Let the cookies cool for at least 15 minutes before serving.


Serving: 1cookieCalories: 160kcalCarbohydrates: 21gProtein: 2gFat: 8gSaturated Fat: 1gPolyunsaturated Fat: 3gMonounsaturated Fat: 3gTrans Fat: 0.03gCholesterol: 16mgSodium: 83mgPotassium: 23mgFiber: 0.4gSugar: 13gVitamin A: 23IUCalcium: 5mgIron: 1mg
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By on June 29th, 2022

Hi, I'm Lauren!

I love to cook -- but even more importantly, I really like to eat! I have a demanding day job that keeps me busy, so time is precious. I'm a culinary school graduate and five-time cookbook author who's all about finding ways to make delicious, restaurant-quality meals at home on a tight schedule. Read more...

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