Chocolate Chip S’mores Cookie Bars

Soft and gooey brown sugar and biscoff spiked cookie dough, heaving with chocolate chips and layered with fluffy vanilla marshmallow cream come together in perfect unity to create these mouth watering Chocolate Chip S’mores Cookie Dough Bars. The perfect picnic treat.

Chocolate Chip S'mores Cookie Bars cut into squares on a baking sheet

These Chocolate Chip S’mores Cookie Bars are the ultimate late Summer bake. The nights are drawing in darker and darker every night, that dusk chill is arriving earlier and the temptation to spend evenings in the garden in front of a roaring fire is too much to resist. I’ll admit it, I’m a full blown Autumn child, you caught me! Me and my wellies are poised and ready for leaf kicking season *checks watch*. When I say these cookie bars are the perfect treat for an evening by the fire pit, I really mean it.

Here in the UK, traditional s’mores aren’t something we come by very easily. Graham Crackers aren’t a thing here and our equivalent of a digestive, while they make a decent substitute, just doesn’t quite cut the mustard. That’s why I created these chocolate chip s’mores cookie bars, they’re all the fun of a s’more without the fuss or stress of finding all the right ingredients. Plus they’re way less messy, I dunno if that’s a good or a bad thing (I kinda like the mallowy claggy chops you get), but there we go.

Tips for making Chocolate Chip S’mores Cookie Bars

  • Marshmallow Fluff – This vanilla flavoured spreadable marshmallow can be a bit of a pain to find, it used to be you could find it in almost every supermarket but it’s became quite elusive in recent years. If you can’t locate it in your favourite shopping establishment you can usually find it in American Candy Stores (most towns have them, you know the ones that charge £10 for a packet of Pop Tarts!) or you can order it direct from Amazon.
  • Biscoff Spread – The Biscoff Spread adds a delicious biscuity flavour to the cookie dough, I absolutely love it but if you can’t find it you can substitute it for peanut or almond butter. Just be aware it will change the flavour of the overall bake but will still be crazy delicious.
  • Chocolate Chips – I like plain chocolate chips (I used a mixture of Dr Oetker Giant Chocolate Chips and regular plain chocolate chips) but you can use any kind you like. Even white, while not traditional, would taste great in this baby!
  • Making it Gluten Free – I haven’t tested this recipe with Gluten Free flour but a 1:1 ratio would work out fine. I’d recommend using Doves Gluten Free Flour Blend as I always have the best results using this brand. Please let me know in the comments if you decide to try this out.
Chocolate Chip S'mores Cookie Bars piled on a grey plate
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Chocolate Chip S’mores Cookie Bars

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5 from 10 reviews


Units Scale
  • 100g unsalted butter
  • 50g caster sugar
  • 100g light brown sugar
  • 75g smooth Biscoff Spread
  • 1 large, free range egg
  • 1 large, free range egg yolk
  • 2tsp vanilla paste
  • 150g plain flour
  • 1/2tsp salt
  • 150g chocolate chips
  • 1 7oz jar Mashmallow Fluff


  1. Preheat the oven to 175C and grease and line a 8×8″ square baking tin.
  2. In the bowl of an electric mixer add the butter and sugars and mix for 3-5 minutes until light and fluffy. Add the Biscoff spread, egg and egg yolk and mix until combined.
  3. Add the flour and salt to the bowl and mix until just combined.
  4. Stir the most of the chocolate chips through the cookie batter by hand until evenly distributed. Keep a few back to sprinkle on top of the cookie bars.
  5. Transfer 2/3 of the cookie dough into your prepared tin and smooth it out in an even layer. Spoon the Marshmallow Fluff on top of the dough and using a hot spoon (run it under hot water for a few seconds) spread it evenly over the dough.
  6. Dollop the remaining cookie dough over the top of the Marshmallow Fluff in lumps, you want to leave patches of Fluff peeking through.  Sprinkle the remaining chocolate chips over the dough.
  7. Bake for 30 minutes or until golden brown and puffy.
  8. Allow the bars to cool completely before cutting.


The cookie dough bars will keep for up to 3 days in an airtight tin in the fridge but are best eaten the day they’re made.

You can get Marshmallow Fluff in some supermarkets, most American Candy stores (that’s where I got mine) or on Amazon.

  • Prep Time: 10 minutes
  • Cook Time: 30 minutes
  • Category: Brownies and Bars
  • Method: Baking
  • Cuisine: American


  1. Jerika
    September 2, 2021 / 8:27 am

    Looks so yummy!:) I can’t wait to try this CHOCOLATE CHIP S’MORES COOKIE BARS.:) It’s one of my favorites. Thanks!:)

  2. Alexandra
    September 2, 2021 / 8:53 am

    These bars really are the perfect sweet treat! My whole family loved them.

  3. Jeannie
    September 2, 2021 / 8:55 am

    I love Biscoff spread and I have it right now, will be trying this recipe it looks so delicious!

  4. Natalie
    September 2, 2021 / 2:46 pm

    This is perfect treat for weekends. I’m going to make this for sure. Looks delicious. Just need to buy biscoff spread. Any subs you recommend in case I don’t find it?

    • September 3, 2021 / 7:00 am

      Hi Natalie,

      If you can’t find Biscoff any cookie butter will do. You can also sub with peanut or almond butter but these will give the bars a nutty taste.

      Katie xoxo

  5. amanda
    September 2, 2021 / 3:36 pm

    We made these and my kids devoured them. So delicious!

  6. September 2, 2021 / 5:00 pm

    Drooling over these! Thank you for the recipe 🙂

  7. Luca
    September 2, 2021 / 9:34 pm

    These are perfect treats for weekends. I will definitely make this next week, they look so delicious!

  8. September 2, 2021 / 10:51 pm

    This recipe looks dangerous! Dangerously addictive! You had me at Bsicoff!

  9. Oscar
    September 4, 2021 / 10:13 pm

    These bars were amazing. I made them for a picnic I was invited to and everyone devoured them.

  10. September 9, 2021 / 11:00 pm

    To die for!! I will make them again to take to some friends this coming weekend.

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