A perfect half baked S’mores Protein Mug Cake made with chocolate protein powder, and complete with grahams and marshmallow! This healthy S’mores mug cake is flourless, sugar free and fat free, but satisfies all the cravings for the summer dessert!

It’s been a while since I’ve made one of these half baked fudgy mug cake recipes, and this S’mores mug cake was the perfect way to be back.

The rich but healthy and fudgy chocolate mug cake with the crunch of graham crackers and the toasted marshmallows.

A real guilt free indulgence here with no flour, oil, butter or sugar!

Ingredients for Half Baked S’mores Protein Mug Cake

This single serve S’mores protein mug cake is made with a few simple and healthy ingredients, and has no butter or oil and no sugar either!

Chocolate Protein Powder for high protein brownie that’s also sugar free.
I used ProteinWorld Whey, but the ProteinWorld Slender Blend is another great option. Code HAYLSKITCHEN gets you a discount on both.
A third alternative would be Quest, but you would need more milk here since this is a whey-caesin blend.
Unsweetened Cocoa Powder or Cacao Powder (for a rich S’mores mug brownie!)
Coconut Flour
Egg Whites for extra protein
Unsweetened Almond Milk
Baking Powder

And for the S’mores effect:

Honey Graham Crackers
Mini Marshmallows

If you need to add more sweetness, Stevia Powder or Zero Calorie Sugar Substitute; I use Lakanto, to keep this marshmallow protein mug cake recipe low sugar; (code HAYLSKITCHEN for a discount here too)

Tips to make S’mores Protein Powder Mug Cake

This fudgy S’mores protein powder brownie really is an easy one and made in a mug or ramekin, but make sure you do all of this stuff to get is perfect.

Grease the ramekin! You want the flourless protein mug cake to come off easily.
Use an oven-safe mug if you need.

Don’t over-mix the batter!
Make sure you gently fold the dry mix into the wet to combine them.
If you over-mix it, protein powder will make your protein mug cake tough, dense and gummy.

Taste the batter and see if you need some extra sweetener. I’d recommend using stevia powder to maintain the consistency of the batter.

Don’t overbake the mug cake. The top will should be just cooked. It might look soft, but will harden when it cools a bit.
It will continue to cook when out, and you want the proper fudgy graham cracker mug cake center.

For a Microwave S’mores Mug Cake

This healthy s’mores in a mug can be made in the microwave or oven!

For a microwave s’mores mug cake, pour batter into a large mug (at least 1⅓ cup size), and microwave 2 min.

Alternates for this Healthy S’mores

I recommend making this single serving healthy S’mores mug cake using the ingredients and protein powder listed since it gives the best results.

If you need other options for the flours and such, here’s some alternatives for a healthy low calorie protein mug cake for one:

Chocolate Protein Powder: Use Vanilla
Whey-Caesin Protein Powder: Use 6 Tbsp + 2 tsp Milk
Coconut flour: Try using about 3 Tbsp of Almond Flour
Egg Whites: 2 Tbsp aquafaba (chickpea liquid). I haven’t given this a try yet though.
Almond Milk: Any other milk

A Vegan S’mores Mug CakeRecipe

This gooey S’mores protein mug cake recipe has no butter or milk and can easily be made Vegan too.

For the perfect Vegan S’mores mug cake, make sure you use a plant based protein powder and aquafaba.
ProteinWorld has a Vegan protein blend that would work well here (HAYLSKITCHEN for the discount here too).

Make sure to also use Vegan marshmallows in this protein microwave mug cake.

More Single Serving Protein Mug Cake Recipes

More Healthy S’mores Desserts to Try