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Chocolate Sponge, Marshmallow Fluff Buttercream Frosting, Toasted Marshmallows and Crushed Biscuits make the ultimate S’mores Cake to end all S’mores. Easy, Delicious, and Sweet…yum.


I’ve been wanting to make a S’mores Cake for a good while now, but I knew I should wait till Autumn and Halloween/Guy Fawkes time to post it. Bonfire Night is great, and I always make an awkward UK version of S’mores with Digestives, but it’s still damn delicious.

What can you not like about Marshmallow, Chocolate and Biscuits all smooshy and melted together? YUMMY. Like seriously, it’s not necessarily for the people who don’t like very sweet things, BUT OH MY DAYS ITS DELICIOUS.

I went for a Chocolate Cake to keep with the theme of Chocolate and Marshmallow together, but you could easily just make it a plain sponge instead by using 400g of Self Raising Flour and removing the Cocoa Powder from the recipe. It depends on what you like, but I was craving Chocolate so.

I used the same sponge recipe as I did the other day with my Halloween Drip Cake, but that’s just because I love it. Notes below in the ‘Tips and Ideas’ section about how to make a smaller version!



I then based the buttercream recipe on my S’mores Cupcakes post. However, instead of just doubling the recipe, I decided to still only use one tub of Marshmallow fluff so that the recipe wasn’t too slack. I’ve tried it in the past and I wouldn’t say it the best for covering the sides, so only using one tub made it the perfect amount. Just sweet enough as well!

I realise that this recipe is slightly lacking in the biscuit department, but I wasn’t too sure on how else to introduce it to the mix. American recipes I have seen have used graham crackers in the sponge mix, but I wasn’t sure how well this would work with Digestives.

You could add biscuits between each layer, and some mini marshmallows if you like, but I reckon the biscuits might go soggy whereas the ones on top of the chocolate don’t. It’s up to you, but the cake is delicious as it is either way. I think after the success of my Oreo Drip Cake, I reckon you’ll adore this too.



I like the idea of a Semi-Naked cake, so I never have the thickest amount of buttercream on the sides, but as you will naturally have a little leftover if you do the scraping method, you can just slather it back on to use it up again if you wish. I tend to eat the leftover Marshmallow Fluff Buttercream Frosting with some spare digestives and such… my bad… but jeez its so delicious!

I, however, do use Dark Chocolate in this in comparison to Milk Chocolate to counteract the sweetness of the Frosting, as I personally think using Milk Chocolate would be too much. If you do still struggle with sweet things even with using Dark Chocolate, you could try adding some salt to the chocolate drip and have the saltiness to combat it instead. I hope you love this recipe as much as I did, enjoy! x


S'mores Drip Cake!

Chocolate Sponge, Marshmallow Fluff Buttercream Frosting, Toasted Marshmallows and Crushed Biscuits make the ultimate S’mores Cake to end all S’mores. 
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Category: Cake
Type: Drip Cake
Keyword: S'mores
Prep Time: 20 minutes
Cook Time: 30 minutes
Total Time: 50 minutes
Servings: 16 Slices
Author: Jane's Patisserie



  • 400 g Unsalted Butter
  • 400 g Light Brown Sugar
  • 8 Medium Eggs
  • 325 g Self Raising Flour
  • 75 g Cocoa Powder
  • 2 tsp Baking Powder

Marshmallow Frosting

  • 400 g Unsalted Butter (room temp)
  • 850 g Icing Sugar
  • 1 tsp Vanilla Extract
  • 1x tub Marshmallow Fluff (200g)


  • 150 g Dark Chocolate
  • 1-2 tbsp Vegetable/Sunflower Oil
  • Marshmallows
  • Biscuit Crumbs


For the Cake!

  • Heat the oven to 180C/160C Fan and line three 20cm/8inch cake tins with baking parchment – leave to the side.
  • In a stand mixer, beat together the butter and light brown sugar until light and fluffy. 
  • Add in the flour, cocoa powder, beaten eggs, baking powder and beat again briefly till combined – try not to over beat the mixture! 
  • Divide the mixture between the three tins and smooth it over – bake for 25-30 minutes until a skewer comes out clean when poked, and when the cake springs back.
  • Once baked, leave the cake to cool in the tin for 10 minutes, and then remove and leave to cool fully on a wire rack. If the cake has domed slightly, leave the cake to cool upside down to flatten it slightly.

For the Frosting!

  • In a stand mixer, beat the room temperature butter with an electric mixer until it is smooth and loose and then beat in the icing sugar 1/3 at a time until its fully combined.
  • Keep beating the buttercream for a few minutes so it starts to get fluffier and lighter.
  • Add in the tub of Marshmallow Fluff and beat again – till wonderfully combined!

For the Decoration!

  • Once the cakes are cooled, put the first layer on the serving plate spread some of the buttercream onto the top of the first layer, add the second cake on top, and then top again with some of buttercream and then add the final sponge layer. Only use about 2-3 tbsps of buttercream per layer so that you have enough to decorate with!
  • With the leftover buttercream, as you can see, I covered the sides (and top) too! Do a first layer of around the edge and top using a large metal scraper and refrigerate for 10 minutes. 
  • Repeat again with a slightly thicker layer of buttercream. I slather it on all over using an offset spatula and then run the metal scraper round until its smooth. You put more on compared to what will stay on because when you smooth it over, you will naturally scrape some back off again. 
  • Refrigerate the cake for about 20 minutes (if you can) to firm it up.
  • Once finished, melt the Dark Chocolate in a heatproof bowl until melted. Add in 1tbsp of oil and beat till smooth, continue to add oil till you get to a drippy consistency. I use 2tbsps of Oil for Dark Chocolate drips, but some chocolates might need more or less.
  • Using disposable piping bags, pipe it around the edge of the cake, edging over slight bits to create the drip. You don’t need to use too much per drip as it’ll drop quite far down by itself! Fill in the top in with the rest of the chocolate so the top is also covered.
  • Add some larger marshmallows around the edge of the top of the cake and toast them slightly with a blowtorch for a bonfire marshmallow effect. Crush over some biscuits and leave the chocolate to finish setting! Enjoy!


  • You can tell the cake is cooked because when its not done it’ll make a bubbling/crackling sound, whereas when it is done, the sound will have stopped!
  • You could add in some mini marshmallows between each layer, as well as some biscuits if you like to make it extra S’moresy!
  • All of the decorations are completely optional – but I love this style of cake! To make a smaller version of the cake, use:
    • Two 8″cake tins
    • 300g Butter
    • 300g Sugar
    • 245g Flour
    • 55g Cocoa Powder
    • 1.5tsps baking powder
    • It might take an extra 5-10 minutes to bake
    • Use 2/3 of the decoration recipes!
  • You obviously don’t have to make straight edged buttercream if you don’t want to, but I just like the look of it! You can slather it on, and it’ll still taste damn delicious. 
  • However, if you do want to make it like this, I seriously recommend using a metal scraper for the decoration of the buttercream, and the disposable piping bags.. I wouldn’t be anywhere without them!
  • This cake will last in an airtight container for 3 days!


Find my other Cake & S’mores Recipes on my Recipes Page!

You can find me on:

J x

© Jane’s Patisserie. All images & content are copyright protected. Do not use my images without prior permission. If you want to republish this recipe, please re-write the recipe in your own words and credit me, or link back to this post for the recipe.


  1. Chloe on September 5, 2022 at 8:46 am

    How would you make the marshmallow buttercream chocolate ? Would you just add melted chocolate to taste ?

    • Jane's Patisserie on September 14, 2022 at 4:23 pm

      Hiya! I would recommend cocoa powder, so it’s not too wet! Hope this helps! x

  2. Chloe on July 8, 2020 at 10:05 pm

    Can I use stork instead of unsalted butter for this recipe? Thanks x

    • Jane's Patisserie on July 9, 2020 at 9:26 am

      For the cake yes, but not the decoration! x

  3. Julia on December 22, 2019 at 10:43 am

    Hi Jane, thanks for this recipe! I made it for my dad’s birthday and he absolutely loved it!

    Just one question though – vanilla extract is listed in the ingredients for the frosting but not actually mentioned in the recipe, so I realised after I made the cake that I hadn’t added it! Did I miss something or does this need to be corrected?

    Either way, the cake was still delicious 🙂 x

  4. Holly on October 29, 2019 at 8:05 pm

    Hi Jane,
    Do you know if there is an easy way to toast the marshmallows on top of the cake if you don’t have a blowtorch? I love the look but couldn’t justify buying one. Thanks 🙂

  5. Tyra Fallon on November 8, 2018 at 10:34 am

    Hi Jane
    Making this at the weekend for a bonfire party but can’t locate marshmallow fluff anywhere 😩 could I just use melted marshmallows in place?? As looked at making my own but can’t find corn syrup anywhere too 🙈 thanks

    • Jane's Patisserie on November 8, 2018 at 11:26 am

      I’ve always found it in supermarkets near nutellas and such, but I’m afraid I’ve never tried with melted marshmallow. I’m unsure if it’ll work as it will probably just melt the buttercream!

    • Tyra Fallon on November 8, 2018 at 12:33 pm

      Thanks for replying. Yes I thought about that after I posted my comment. Ive been to Tesco, B&m, Morrison and local garden centre. Still to try Asda and home bargains so fingers crossed they have some. If not it’ll just have to be vanilla buttercream 😩 thanks again

    • Jane's Patisserie on November 8, 2018 at 5:49 pm

      Ahh yeah, I’m right on the southcoast of england but have it in Tesco and probably B&M as well as other stores so maybe they just don’t sell it as much near you! But vanilla buttercream would be fine, just add some mini marshmallows in between each layer or something!

    • Tyra Fallon on November 8, 2018 at 8:12 pm

      I live in a small town in the north east , so proberly why I can’t find it. That’s a great idea thank you.

  6. emily p on September 20, 2018 at 12:14 pm

    Hi Could you make this in two layers instead of three?

    • Jane's Patisserie on September 20, 2018 at 1:16 pm

      Yep! Notes on how in the tips section.

  7. Katie on June 10, 2018 at 10:10 am

    Hi I was wondering if we are making a smaller cake with only 2 8″ tins do we still need to use 8 eggs or less??
    Thank you

    • Jane's Patisserie on June 10, 2018 at 10:37 am

      Noo you would need 300g of everything, so basically 6 medium eggs x

  8. Anna on February 23, 2018 at 1:32 pm

    Can you use milk chocolate for the drip or does it have to be dark? Also, do you have a video that shows how to do the drip? I have never done a drip cake before and I am hoping to attempt it next week for a birthday

    • Jane's Patisserie on February 23, 2018 at 7:02 pm

      You can use milk chocolate but you need to use half the amount of oil as its naturally thinner than dark chocolate. & I have a drip cake video on my youtube channel!

  9. Amanda on February 15, 2018 at 8:06 pm

    Hi There, I am wondering how much I should increase the ingredients if I am using a 9″ cake pan?


  10. Pat on June 7, 2017 at 11:05 am

    Hi, can you tell what marshmallow fluff consists of so I can try to make or buy a substitute in Australia please?

    • Jane's Patisserie on June 7, 2017 at 4:24 pm

      I would recommend googling it ? Its a marshmallow spread basically.

  11. Paula on June 2, 2017 at 5:42 pm

    Hello, this chocolate cake looks delicious!
    Just wondering as this would make 3 x 8″ layers. How can determine what size square pan I can use to bake it? Love your blog!

    Many thanks, Paula

    • Jane's Patisserie on June 2, 2017 at 5:49 pm

      Thank you! A Circle size is a inch bigger than the square size you would need… so 8″ Circle = 7″ Square, 7″ Circle = 6″ Square if that makes sense? 🙂 x

    • Paula on June 3, 2017 at 1:57 pm

      Perfect! Thanks so much ?

  12. […] Toasted marshmallows on a cake is totally a thing! Here's how to make a s'mores drip cake. […]

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