Mug Cakes & Meals

S’more Mug Cake (from Gemma’s Mug Meals e-book)

4.33 from 34 votes
Learn how to make my S'more Mug Cake, an easy chocolate and marshmallow cake, featured in my Gemma's Mug Meals e-book along with 30+ recipes!
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Hi Bold Bakers!

By now you must know I have you covered for any type of Mug Meal you’re looking for. Over the past few years, I’ve received tons of requests for your favorite flavors and one of the most popular has been a S’more Mug Cake. I know exactly what you’re looking for: a fudgy chocolatey cake, a graham cracker crust and of course, tons of marshmallows. You get all that and more with my S’more Mug Cake recipe, and just like my other mug recipes it only takes a few minutes to make.

Who would have ever thought a professional chef from Ireland would be creating Microwave Mug Recipes? Not me, that’s for sure. But when a fan first requested that I make a cake without an oven, I challenged myself to make recipes that were truly game-changing or “Bold” as I would say. It’s only been a year since I branched out from Mug Cakes and Breakfasts to entire Mug Meals. My Microwave Mug Meals video released last January has been viewed more than 3 million times and it really got me thinking about all the real food you can make fast. And I thought, why not bring together some of your favorite mug recipes with a ton of new ones in my first e-book, Gemma’s Mug Meals. You’ll find classics like Mug Pizza and Mug Donut (Mugnut) as well as hopefully some new favorites like a Salted-Caramel Mug Cake, Indian Curry, Vegetarian Chili and of course this S’more Mug Cake.

Enjoy a FREE sampler of my Gemma’s Mug Meals e-book below. You’ll get a FREE downloadable PDF including my S’more Mug Cake recipe along with a preview of the other recipes in the book. I hope you enjoy this little gift from me. I really appreciate all of you being part of the Bold Baking Community!

Click HERE for a FREE downloadable PDF with my S’more Mug Cake recipe!

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Watch The Recipe Video!

S'more Mug Cake

4.33 from 34 votes
Author: Gemma Stafford
Servings: 1 mug cake
Prep Time 5 mins
Cook Time 2 mins
Total Time 7 mins
Author: Gemma Stafford
Servings: 1 mug cake


  • 3 tablespoons all purpose flour
  • 3 tablespoons brown sugar
  • 3 tablespoons Cocoa Powder
  • 3 tablespoons flavorless oil (canola oil/coconut oil/sunflower oil)
  • 3 tablespoons water
  • pinch of salt
  • 1 ⁄2 teaspoon vanilla extract
  • 2 tablespoons cookie crumbs
  • 3 marshmallows


  • In a microwavable mug mix together all of the ingredients..
  • If you don’t want to cook them off straight away, then place them in the refrigerator for up to 24 hours.
  • Microwave for 45-60 seconds. (Timing is based on my 1200W microwave so your timing might vary).
  • Once the mug cake is firm, sprinkle over the cookie crumbs and place on the marshmallows.
  • Microwave for another 20 seconds to make the marshmallows soft and fluffy.
  • Serve warm with vanilla ice cream & enjoy!

Recipe Notes

Cooking time will vary greatly depending on your microwave and the width and depth of the mug. The mugs I use are small, roughly 6oz (¾ /1 cup)
Always keep a close eye on your mug while in the microwave so it doesn’t over flow or over cook


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Mné Kidwell

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3 years ago

I love this website and baking and i am only nine.
I love you.

4 years ago

Gemma, It just doesn’t get any better than this. Life is a much better place with Gemma in it.

2 months ago

This is very dense and the cake is very chocolatey. I’d rather it be more cake like as opposed to being fudge/brownie texture. I think It should have baking powder.

6 months ago

I only have dehydrated marshmallows and only crackers, not graham crackers. Will the recipe still work?

7 months ago

Gemma my Grandson in U.K. and my granddaughter in USA are both going to Uni soon . Is it possible to gift them your e book on mug meals?

8 months ago

Delicious! Subbed applesauce for 2 of the tbsp of oil. Separated it in to two mugs and microwaved for 45 seconds. Nice and cakey!

Kim Singer
1 year ago

I can’t edit my review, but just wanted to say that definetly use a larger mug (My older sister used a small mug and it went everywhere lol, it’s already half gone neverthelsess

Kim Singer
1 year ago

I made this and it turned out wonderful! My sister and brother walked in on me and my sister is now making it (My brother had unfortunately to do something else) I though that it wouldn’t work since it didn’t have a rising agent, but it worked great. I used three halves of cinnamon graham crackers. Turned out wonderful!

Stuart of Blyth
1 year ago

Just made my first one, and halfway through eating it I can confidently say it’s the first of many. It’s out of this world and my new favourite. The local supermarket was selling Russian-style vanilla ice-cream so I got some and it’s absolutely perfect with the S’more.

george jefferson
george jefferson
2 years ago

this recipe has too much coco

About Us

Meet Gemma

About Us

Meet Gemma

Hi Bold Bakers! I’m Gemma Stafford, a professional chef originally from Ireland, and I want to help you bake with confidence anytime, anywhere! No matter your skills, I have you covered. Sign up for my FREE weekly emails and join millions of other Bold Bakers in the community for new recipes, baking techniques, and more every week!