chocolate vanilla mug cake with marshmallows and chocolate chips in speckled ceramic bowl

This single serving S’mores Mug Cake features a graham cracker flavoured cake, studded with melty chocolate chips and marshmallows. The perfect fuss free and easy alternative to satisfy your s’mores craving, ready in 1 minute! (Vegan, Gluten Free + Oil Free)

S’mores mug cake for mug cake week day 6! Inspired by my strong craving for s’mores since the weather has gotten much nicer (most days) and the sun setting at 8:30 pm.

Even though it’s still technically spring, I feel like in Toronto we just whizz by spring and fall and just jumps right into summer or winter. And lately, it’s been a summer vibe ya know?

s'mores mug cake ingredients on a tile

I contemplated and tested a couple variations for this mug cake in terms of the base. Should I go for a cookie cake base or a chocolate cake base? My taste testers all agreed that the cookie cake base was much better because it didn’t over powder the graham crackers and marshmallows as much as the chocolate base did sooo thats what I went with. The ingredients are loosely based off my chocolate chip mug cake with just a couple changes:

  • Flax Egg: Gives it that chewy cookie like texture!
  • Drippy Nut Butter: Replaces oil or butter and gives it moisture. I like to use almond butter, cashew butter or tahini here because it doesn’t alter the flavour as much as peanut butter would.
  • Sugar: I love using coconut sugar in my mug cakes but cane sugar gives it a nice crispy surface which is really tasty too.
  • Oat Flour: Like all of my mug cakes, it’s made with a base of oat flour but it can easily be replaced with spelt or all purpose flour.
  • Chocolate Chips + Marshmallows + Graham Crackers: It ain’t s’mores without these components right? If you can’t find vegan graham crackers, you can also sub with a crispy cookie or some sort.

TIP: If you prefer a chocolate base s’mores cake, swap 1 tbsp of the oat flour with cocoa powder!

The simplicity of this s’mores dessert wins me over. All of the ingredients go into a mug and gets cooked in the microwave for about 1 minute. No setting up a fire, no smelling like a BBQ right after, no fuss and ready in 2 minutes.

And what you’re left with if a super duper delicious cookie like cake in a mug with melty chocolate, marshmallows and crispy graham crackers. So much textures going on here I LOVE IT.

Until I can justify setting up a whole camp fire to toast some marshmallows, this is going to be my BFF for nights when I’m craving some s’mores.

vanilla cake topped with marshmallows and chocolate in a bowl with a spoon

If you’re looking for some tips and tricks to getting the perfect mug cake, check out my first Banana Bread Mug Cake recipe post for all the deets! It covers everything from the best cook time for your microwave, how to tell when your mug cake is done and more.

close up shot of smores mug cake in ceramic bowl

More Vegan Mug Cakes to Love!

close up shot of spoon in cookie mug cake with marshmallows and chocolate chips in speckled ceramic bowl

If you recreate this S’mores Mug Cake recipe let me know how you liked it by leaving a comment and rating below or by tagging me on Instagram @Okonomikitchen, I love seeing all of your tasty recreations!

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vanilla cake topped with marshmallows and chocolate in a bowl with a spoon

Vegan Smores Mug Cake

  • Author: Lisa Kitahara
  • Total Time: 2 minutes
  • Yield: 1 serving 1x


This single serving vegan S’mores Mug Cake features a graham cracker flavoured cake, studded with melty chocolate chips and marshmallows. The perfect fuss free and easy alternative to satisfy your s’mores craving!




  1. Add flax egg, drippy nut butter, non dairy milk, coconut sugar and vanilla into a microwave safe mug and stir to combine.
  2. Add in oat flour, graham cracker flour, baking powder and salt. Fold in 1 tbsp of chocolate chips and 1 tbsp of marshmallows. Top with remaining chocolate chips, marshmallows and graham crackers.
  3. Microwave on high (1000 W) for 1 minute. Add 10-20 seconds if needed. Let it cool for 1 minute and dig in!


  • *Graham Cracker Flour: To make graham cracker flour, add a couple graham crackers into a food processor until flour like consistency (looks like almond flour). I use about 6 graham crackers in a small food processor and store it in a mason jar for future use. 
  • Helpful Equipment: 8 oz mug or bowl, 10 oz mug or bowlmini spatula 
  • Nutritional Information Disclaimer: Nutrition information is a rough estimate calculated on an online tool (Cronometer).
  • Prep Time: 1 minute
  • Cook Time: 1 minute
  • Category: desserts
  • Method: microwave
  • Cuisine: vegan, gluten free


  • Serving Size: 1 serving
  • Calories: 424
  • Sugar: 28.7
  • Sodium: 195mg
  • Fat: 17.4
  • Saturated Fat: 4.2
  • Unsaturated Fat: 11.3
  • Trans Fat: 0.16
  • Carbohydrates: 59.1
  • Fiber: 6.4
  • Protein: 9.9
  • Cholesterol: 0

Keywords: vegan mug cake, smores cake, gluten free mug cake, microwave chocolate chip cake


s'mores mug cake pinterest graphic

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About Lisa

I'm Lisa, a home cook, recipe developer and founder of Okonomi Kitchen. Here, you'll find a mix of classic and modernized Japanese recipes, and creative, plant-forward meal inspiration using seasonal ingredients. I hope to share more about Japanese cuisine and culture through food and recipes.

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  1. I happened to have a few leftover marshmallows and some already ground up graham crackers from another recipe, so this was a great find.

    This was an awesome mug cake! They don’t always work out in my experience but the texture here was great. Will be making this again. I love to eat to the bottom and then add some oat milk to the mug.

    Oh and we made two at once and it took just about double the cooking time… I loved watching them fluff up in the microwave! 😆

  2. this was delicious!! just what i wanted and so gooey. everything came together and was easy to do, as mug cakes should be😉 i had to sub almond + coconut flour and cook a little longer, but just yum🤍🤍