Sugar-free, carb-free, and delicious Keto Marshmallows are a real thing and can be made at home with just three simple ingredients.
Of course, you can't eat your favorite Jet-Puffed Marshmallows on a keto diet but you can easily make a keto version at home with our simplest recipe. It's easy and offers the tastiest marshmallows even non-keto people will enjoy.

Jump to:
- Preparation and Cooking Overview
- Chef's note
- Ingredients for this Keto Marshmallow Recipe
- Why Not to Use Erythritol for Keto Marshmallows?
- Additional Ingredients
- Cooking Tools Required
- How to Make Keto Marshmallows: Step-by-Step Guide
- What to Serve with Keto Marshmallows
- Storage Instructions
- Recipe Wrap-Up and Conclusion
- Frequently asked questions
- 📖 Recipe
Preparation and Cooking Overview
Making low-carb marshmallows at home starts with blooming gelatin in cold water. Then, you prepare a sweet syrup and combine those two until light, fluffy, and, tripled in size. Finally, let the mixture sit for a couple of hours and get ready to enjoy homemade sugar-free marshmallows.
Chef's note
If you're making these marshmallows with your kids, try using fun natural food coloring like beet juice or turmeric to create vibrant colors. It’s a great way to involve them in the process and make the experience even more enjoyable at home!
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Ingredients for this Keto Marshmallow Recipe
You only need simple ingredients to make keto marshmallows at home:
Why Not to Use Erythritol for Keto Marshmallows?
We first tried making these marshmallows with erythritol, but the results were less than ideal. Erythritol tends to recrystallize, creating a gritty texture that just doesn't work for candy-making. Its cooling aftertaste also overpowered the delicate sweetness marshmallows need. That’s why we opted for allulose, and the results were more than expected.
Additional Ingredients
Cooking Tools Required
How to Make Keto Marshmallows: Step-by-Step Guide
Cooking Methods
Preparation Steps
- Gather and measure all the ingredients.
- Line an 8x8 inch pan with parchment paper, leaving some overhang to easily lift out the marshmallows later.
Cooking Instructions
- In a big mixing bowl, sprinkle the gelatin over ¼ cup (60ml) of cold water. Let it sit for 5 minutes to bloom.
- In a small saucepan, combine the remaining ¼ cup (60ml) of water and the sweetener. Heat over medium heat, stirring until dissolved. Attach a candy thermometer and cook the syrup until it reaches 240°F (116°C), about 5-7 minutes.
- Once the syrup reaches the desired temperature, carefully pour it into the bowl with the gelatin mixture. Start mixing on low speed.
- Gradually increase the speed to high and whip the mixture for 8-10 minutes, or until it becomes thick, fluffy, and tripled in volume.
- In the last minute of whipping, add the vanilla extract, salt, and any optional flavoring or food coloring.
- Pour the marshmallow mixture into the prepared pan, spreading it evenly with a spatula.
- Allow the marshmallows to set at room temperature for about 2 hours or until firm.
- Finally, cut them into squares with a sharp knife, dust them with keto-friendly powdered sweetener, and enjoy!
Chef's pro tip
The key to making great keto marshmallows is in the whipping process. Make sure to whip the mixture long enough to get that classic marshmallow fluffiness. Don’t rush the setting time; remember patience is key here!
What to Serve with Keto Marshmallows
Storage Instructions
Recipe Wrap-Up and Conclusion
These keto marshmallows are a game-changer for anyone on a low-carb diet. Light, fluffy, and just sweet enough, they’re perfect for indulging without the guilt. Enjoy them in your favorite recipes, or snack on them straight from the jar!
Frequently asked questions
📖 Recipe

Keto Marshmallows
Ingredients
- 3 tablespoons gelatin powder
- ½ cup cold water divided
- 1 cup granulated allulose
- 1 teaspoon pure vanilla extract
- 1 pinch of sea salt
Instructions
Preparation Steps
- Gather and measure all the ingredients.
- Line an 8x8 inch pan with parchment paper, leaving some overhang to easily lift out the marshmallows later.
Cooking Instructions
- In a big mixing bowl, sprinkle the gelatin over ¼ cup (60ml) of cold water. Let it sit for 5 minutes to bloom.
- In a small saucepan, combine the remaining ¼ cup (60ml) of water and the sweetener. Heat over medium heat, stirring until dissolved. Attach a candy thermometer and cook the syrup until it reaches 240°F (116°C), about 5-7 minutes.
- Once the syrup reaches the desired temperature, carefully pour it into the bowl with the gelatin mixture. Start mixing on low speed.
- Gradually increase the speed to high and whip the mixture for 8-10 minutes, or until it becomes thick, fluffy, and tripled in volume.
- In the last minute of whipping, add the vanilla extract, salt, and any optional flavoring or food coloring.
- Pour the marshmallow mixture into the prepared pan, spreading it evenly with a spatula.
- Allow the marshmallows to set at room temperature for about 2 hours or until firm.
- Finally, cut them into squares with a sharp knife, dust them with keto-friendly powdered sweetener, and enjoy!


Sharon says
Can you dip these in melted chocolate for chocolate covered marshmallow Eggs.?
Cast Iron Keto says
Hi Sharon,
Absolutely! Just dip them in melted sugar-free chocolate, let them set in the fridge, and enjoy!