S’Mores Cake

The snow has melted and it’s officially s’mores season! Yep, you can catch me out pretty much every weekend in the backyard by the fire roasting up a marshmallow to golden perfection ready to be sandwiched and devoured in s’mores delight! To celebrate this season, I’ve created an incredibly rich and easy S’Mores Cake using a doctored mix packed full of chocolate, cookies, and marshmallow goodness in every single bite. Let’s start s’moring!

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A dark chocolate cake with a chocolate drip topped with chocolate cookies and mini marshmallows. There is edible gold leaf on the chocolate drip.

Easy S’Mores Cake From Mix

A golden roasted marshmallow, sitting on a rich piece of chocolate, all smushed together with sweet crunchy graham crackers. Everything a s’more should be. Using a box mix as a base, this s’mores cake recipe is easy, approachable, and so completely delicious.

What Is A S’More

A popular campfire treat, a s’more consists of a fire-roasted marshmallow, a piece of chocolate, and two graham crackers to hold it all together thus creating a sandwich-like dessert. It’s sweet, ooey-gooey, and often enjoyed during a backyard bbq or camp night spent around the fire.

A close up shot of a s'mores cake top with mini marshmallows and chocolate covered cookies on top.

How Can I Make S’Mores Easier?

Is it just me or do s’mores tend to get a bit messy? Especially when there are little ones involved. The graham crackers often break which leads to melted chocolate and sticky marshmallow everywhere. Leclerc has solved our sticky s’more situation with their Celebration Butter Cookies.

A buttery golden cookie base with a layer of dreamy milk chocolate right on top. No more balancing a chocolate square while attempting to hold a marshmallow. Throw that toasted marshmallow right in between two of these scrumptious cookies and you’ll be in s’more heaven in no time!

A cake top with chocolate covered cookies and mini marshmallows on it.

Eat More S’Mores to Win Big

And seeing as s’more season has begun, Leclerc is celebrating big this year with a Lucky Box contest. There are over $50,000 in prizes to be won including a grand prize of $25,000. Think of how many cookies you could buy with that! ? Grab a box of the Celebration cookies, either for s’more making or cake making, and have a chance to win some amazing prizes!

How Do I Make A S’Mores Cake?

Back to this decadent s’mores cake though. I wanted to keep this recipe as easy and approachable as possible. Using those delectable milk chocolate butter cookies, I chopped them up and added them right into a doctored cake mix.

A s’more isn’t a s’more without a marshmallow, so again, with ease in mind, I used store-bought marshmallow fluff as the filling. If you are feeling up for the task, here’s a homemade marshmallow fluff filling recipe here in this Mint Hot Chocolate Cake.

A slice of cake with marshmallow filling and dark chocolate frosting laying on a grey plate.

How To Make Fudge Frosting From Scratch

The third and final component of this s’mores cake is the chocolate fudge buttercream frosting. It’s rich, creamy, and so totally luscious. In the bowl of a stand mixer, cream the butter on high speed for approximately 10 minutes. This mixture will become fluffy, glossy, and light in color.

The second step to fudge frosting is to add the icing sugar and cocoa powder together. I recommend using Dutch process cocoa as its taste is second to none but any cocoa powder will do the job. Sift in the dry ingredients and give it a mix on low until it is combined.

Lastly, add in the vanilla and salt and let that baby mix. Crank the mixer up to high and let it cream for 5 minutes until it is fluffy chocolate fudge frosting perfection. Seriously, you’ll want to eat this straight from the bowl.

A s'mores cake topped with chocolate cookies, mini marshmallows, with dark chocolate frosting. There's a large slice taken out of it.

S’Mores Cake Ready

There we are, all three s’more cake components laid out. Easy doctored cake mix layers are full of milk chocolate butter cookies, marshmallow fluff filling, and chocolate fudge buttercream. Let’s top this s’mores confection with an ultra-luxurious chocolate drip, some edible gold leaf inspired by campfire flames, and those tasty little morsels of Leclerc butter cookie delight. And there you have it, A S’Mores cake to ring in s’mores season!

Looking for some other tasty chocolate marshmallow-type treats? Check these out:

A slice of yellow cake with chocolate frosting sitting on a plate in front of the chocolate s'mores cake.

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A S'mores cake with the inside showing. It's filled with marshmallow fluff that ozzing out between the yellow cake layers. Covered in a deep rich chocolate brown frosting.

S’Mores Cake

5 Stars 4 Stars 3 Stars 2 Stars 1 Star

5 from 14 reviews

  • Author: Katie Stymiest
  • Total Time: 1 Hour 25 Minutes
  • Yield: 10 Slices 1x


Fluffy s’mores cake layers using a doctored cake mix with milk chocolate butter cookies baked right in. Filled with marshmallow fluff and covered in a delicious whipped chocolate fudge buttercream frosting. The perfect s’mores cake recipe to celebrate campfire season.



S’Mores Cake

  • 1 box (461 grams) white or yellow cake mix *can sub gluten-free cake mix
  • ¾ cup milk, room temperature *can sub dairy-free milk
  • ⅔ cup sour cream, room temperature *can sub dairy-free sour cream
  • 3 large eggs, room temperature
  • ⅓ cup vegetable oil
  • 1 teaspoon vanilla extract
  • 9 Leclerc Milk Chocolate Butter Cookies, chopped *can sub gluten-free graham crackers
  • 1 cup marshmallow fluff

Chocolate Fudge Buttercream

  • 2 cups salted butter, room temperature *can sub dairy-free butter
  • 4 ½ cups icing sugar
  • 1 ½ cups cocoa powder
  • 1 teaspoon fine sea salt
  • 1 tablespoon vanilla extract

Chocolate Ganache Drip

  • ¼ cup chocolate chips *can sub for dairy-free butter
  • ⅛ cup milk *can sub for dairy-free milk

Cake Decor

  • Leclerc Milk Chocolate Butter Cookies
  • Mini Marshmallows
  • Gold sprinkles and/or edible gold leaf


S’Mores Cake

  1. Preheat the oven to 350 degrees and prepare three 6-inch round cake pans. *
  2. In the bowl of a stand mixer add in the cake mix and quick it a quick whisk to break up any clumps.
  3. Add in the milk, sour cream, eggs, vegetable oil, and vanilla extract and mix on low until combined. Be careful not to over-mix the batter.
  4. Add in the chopped milk chocolate butter cookies and gently fold in with a spatula.
  5. Divide batter between the cake pans and bake for 20-25 minutes or until a toothpick comes out with a few crumbs.
  6. Allow to cool in pans for 10 minutes and then invert on a cooling rack to fully cool.

Chocolate Fudge Buttercream

  1. In the bowl of a stand mixer with the paddle attachment cream the butter on high speed until light and fluffy. Approximately 5-10 minutes.
  2. Add in the icing sugar, cocoa powder, salt, and vanilla extract and mix on low until combined.
  3. Turn the mixer up to high and let mix for 5 minutes until smooth and creamy. Scrape the sides of the bowl when necessary.

Chocolate Ganache Drip

  1. In a microwave-safe bowl, heat the chocolate chips and milk in 30-second intervals, stirring after each interval, until fully melted and smooth.
  2. Depending on the kind of milk, the drip may require a touch more milk to thin or a bit more chocolate chips to thicken. **

Cake Assembly

  1. Place one leveled layer of s’mores cake on a cake board or plate. Top with approximately 1 cup of buttercream.
  2. Pipe a buttercream border around the edge and fill with approximately ½ cup of the marshmallow fluff
  3. Repeat with the remaining layers and apply a thin coat of buttercream all over the cake. Refrigerate for 20 minutes.
  4. Cover the cake with a final layer of buttercream and smooth the sides using a scalloped edge cake comb or a plain smoother. Refrigerate the cake while the chocolate drip is prepared.
  5. On a well-chilled cake, with a spoon or a piping bag, drip the warm chocolate drip over the edges of the cake and put it back in the refrigerator to chill.
  6. Decorate as you desire. I roughly chopped up some extra Leclerc cookies and, along with some mini marshmallows, scattered them around the top edge of the cake. Using edible gold leaf, I gently pressed it onto the chocolate drip and cake. Enjoy!


* This cake can be baked in two 8 inch round pans, two 9 inch round pans, or 24 cupcakes. Baking time will adjust.

** I always test my ganache drips over the edge of the kitchen sink before applying to a cake to check the consistency.

  • Prep Time: 60 Minutes
  • Cook Time: 25 Minutes
  • Category: Cakes
  • Method: Baking
  • Cuisine: American

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  1. This cake was so moist & delicious! I made it for my son’s 17th birthday. The cookies baked into the cake provided an extra layer of texture. The buttercream frosting was delicious, almost a sweet-salty undertone, like a salted chocolate. The marshmallow fluff just makes it perfect. Even my mother-in-law who is not a fan of cake, said she would eat this on repeat, and my son loved it! This is a keeper for sure!

    1. My goodness, Kendra! You could be a food blogger yourself the way you described this cake. Your review has made my whole day. Thank you for sharing!

  2. Made this one for the long weekend and oh my goodness it was amazing. My family raved that it was the best cake ever.

  3. This recipe was so fun and easy to make! I normally never use boxed cake but with Katie’s adjustments it was delicious. The whole cake went together fairly quickly and was delicious!!! It was the perfect way to celebrate a birthday lake side!! Thanks Katie, can’t wait to try another one of your recipes.

    1. I am so thrilled that you gave this recipe a shot. Doctored cake mixes are great for when you need an easy and tasty cake.

      1. Chocolately marshmallow goodness!
        I’m always cautious of things being too much chocolate as I’m more of a vanilla gal but this has a good amount to not be too overpowering and let the other flavors of s’mores shine too 🙂
        Great cake!

  4. “The cake of my life” that’s what my husband said as he ate this today for father’s day. I think it’s safe to say it was a hit.

  5. I made this for our first family gathering since covid and it was exactly what the celebration needed.

    1. Oh Tricia…I am honored to be a teeny tiny part of such a special time. Thank you for making this cake and sharing it with your family.

  6. I’ll admit that I’m a cake snob. I don’t do cake mixes. That said, I simply had to try this one from that inside picture alone. You may have created a cake mix masterpiece here Katie. Honestly…not a single person guessed it was from a mix.

    1. Haha oh my goodness this is the best compliment, Allison. I really appreciate you giving it a shot even though it’s a cake mix!

  7. I tried this cake for my daughters 33rd birthday because she loves s’mores! I gave the recipe a 5 for taste, easy instructions and short ingredient list. I read a ton of s’more cake recipes on Pinterest before deciding on this one. It did not disappoint! ❤️

    1. I am absolutely thrilled you gave this recipe a shot. You cannot beat the ease and yumminess of a doctored cake mix. Thanks for sharing, Tammy!

  8. This cake was so much fun to make and the recipe was easy to follow and produce! I had so much creating it!

  9. Buenas tardes,

    Soy de Colombia y normalmente manejamos las recetas en gramos. Cuando haces referencia a 1 taza, cuanto equivale en gramos?.

    Mil gracias, quedo atenta.

  10. I made this recipe for my son’s 14th birthday, and it was a huge hit! everyone loved it, especially the marshmallow fluff in the middle layers!

    1. Personal preference for how much of a cookie crunch texture you want in the cake. I’d say mine were cut into 1/4 inch pieces approximately.

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