Gluten Free S'mores Mug Cake

There’s nothing quite like the taste of a classic s’more — that toasty marshmallow, melty chocolate, and crunchy graham cracker combo is pure comfort. But when you’re gluten free or just want a faster way to satisfy that craving, this gluten free s’mores mug cake is a total game-changer.

It’s soft, rich, and chocolatey, with bits of gooey marshmallow swirled throughout and a hint of graham cracker flavor in every bite.

The best part? You don’t need an oven, campfire, or even a mixing bowl. Everything comes together in one mug and a microwave — and it’s ready to eat in just 7 minutes from start to finish.

This single-serve treat is perfect for weeknight cravings, after-dinner desserts, or even those times when you want something sweet but don’t feel like baking. It’s naturally gluten free, totally customizable, and made with pantry staples.

Whether you’re treating yourself or sharing with someone special, this mug cake brings the joy of s’mores into a warm, fluffy cake that you can enjoy any time of year.

Why you’ll love this recipe

This mug cake isn’t just fast and easy — it’s seriously delicious. You get that fudgy, brownie-like texture from cocoa powder and almond flour, paired with the nostalgic flavor of graham crackers and sweet marshmallows that toast up beautifully in the microwave.

It’s a single-serving dessert that feels indulgent but takes almost no effort to make.

What really sets it apart is the mix of textures. The cake itself is soft and moist, the chocolate chips melt into little pockets of richness, and the marshmallow topping becomes gooey and golden as it melts over the top.

You don’t need fancy tools or a long ingredient list, just a mug, a spoon, and a microwave. Plus, it’s super easy to adapt for dietary preferences like dairy-free or nut-free.

It’s a win for chocolate lovers, gluten-free eaters, and anyone who enjoys a cozy dessert moment.

Before you get started

Before diving into your mug cake masterpiece, here are a few quick tips to help things go smoothly. First, make sure you’re using a microwave-safe mug that holds at least 11 ounces.

The batter needs space to rise as it cooks, and a smaller mug can lead to spills. If you’re not sure about your mug size, place a plate underneath just in case.

When measuring flour, scoop it lightly with a spoon instead of packing it down. This helps prevent the cake from turning out too dense.

And if you don’t have pre-made graham cracker crumbs, just crush up a few gluten free graham crackers (we love the Schar Honey Grahams) using a zip-top bag and rolling pin or food processor. You don’t need them super fine — a few little chunks add great texture.

Also, don’t forget to cut the marshmallows ahead of time. You’ll mix some into the batter and save one for melting on top. If you want a more dramatic s’mores look, press an extra marshmallow into the center before microwaving for a gooey surprise when you dig in.

How to make gluten free s’mores mug cake

This is one of those magical recipes where everything happens in one mug. You’ll mix your dry ingredients right in the mug — no separate bowls required — then stir in the wet ingredients to create a thick, rich batter.

Chocolate chips and marshmallows are folded in next for that signature s’mores flavor, and the whole thing gets cooked in the microwave in less than two minutes.

The result is a tender, molten chocolate cake with toasty marshmallow on top and melty chocolate chips inside.

It’s cozy, satisfying, and exactly the kind of thing you want to curl up with at the end of a long day. Don’t be surprised if it becomes your new go-to dessert.

Ingredients

Dry

¼ cup gluten free all purpose flour
2 tbsp blanched almond flour
2 tbsp cocoa powder
2 tbsp GF graham cracker crumbs
¼ tsp baking powder
pinch of salt

Wet

¼ cup milk
2 tbsp oil
½ tsp vanilla
3 tbsp light brown sugar (can sub coconut sugar)
2 tbsp chocolate chips (divided)
1 ½ large marshmallows

Step by step instructions to make gluten free s’mores mug cake recipe

Step 1

In a microwave-safe mug, whisk together the gluten free flour, almond flour, cocoa powder, graham cracker crumbs, baking powder, and a pinch of salt until well combined.

Step 2

Add in the milk, oil, vanilla, and brown sugar. Stir well until the batter is completely smooth and no dry spots are left.

Step 3

Stir in half of the chocolate chips. Cut half of one large marshmallow into small pieces and fold those into the batter too.

Step 4

Microwave the mug cake on high for 60 seconds. Add the remaining marshmallow on top, then microwave for another 20 seconds until it’s soft and gooey.

Step 5

Let the mug cake sit for 2 to 3 minutes before digging in — it’ll be hot, and this short rest time helps the texture settle.

Step 6

Enjoy it warm, straight from the mug with a spoon. Want to take it up a notch? Top it off with more chocolate chips, a dash of graham cracker crumbs, or a drizzle of melted chocolate for extra indulgence.

Variations

Chocolate-only mug cake: Skip the graham crumbs and marshmallows for a simple, decadent chocolate treat.
Nut-free option: Swap the almond flour for more gluten free all-purpose flour (texture may be a bit less rich, but still tasty).

Dairy-free version: Use plant-based milk and dairy-free chocolate chips to keep it vegan-friendly.
Double chocolate: Add extra chocolate chips or a small square of dark chocolate to the center of the batter for a gooey middle.
Extra crunch: Sprinkle crushed graham crackers on top after microwaving for more texture and that signature s’mores bite.

How to store

This mug cake is definitely best when eaten fresh and warm, right after microwaving. That’s when the marshmallow is gooey, the chocolate chips are melty, and the texture is soft and cake-like.

If you do end up with leftovers (rare, but it happens!), cover the mug with plastic wrap and store it in the fridge for up to one day.

Warm it up in the microwave for 15 to 20 seconds to refresh the texture. Keep in mind that the texture may be a little firmer after chilling, but it’ll still taste delicious.

For best results, make and enjoy it fresh — it’s so quick, there’s really no need to prep ahead.

Frequently asked questions

Can I make this without almond flour?

Yes! Just replace the almond flour with an extra 2 tablespoons of gluten free flour. The cake may be slightly less rich, but still soft and satisfying.

Can I bake this in the oven instead?

Yes, you can bake it instead, although it’s made for the microwave. Just use an oven-safe ramekin and bake at 350°F for 10–12 minutes, or until the center is set.

What if I don’t have graham cracker crumbs?

No problem — just crush a few gluten free graham crackers by hand or in a blender. If you don’t have any on hand, feel free to leave them out and enjoy a classic chocolate mug cake instead.

Is it okay to use mini marshmallows instead?

Yes! Swap in 4 to 5 mini marshmallows for each large one. You can mix some into the batter and place a few on top before the second microwave round.

Can I make this ahead for dessert later?

You can prepare the dry and wet ingredients ahead of time and mix them when you’re ready to microwave. However, for the best taste and texture, it’s best enjoyed freshly made.

Conclusion

This gluten free s’mores mug cake is the perfect dessert for cozy nights, quick cravings, or just treating yourself without turning on the oven.

With melty chocolate, gooey marshmallow, and graham cracker goodness all packed into one warm, chocolatey mug, it’s everything you love about s’mores — made easy.

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