• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
Cast Iron Keto
  • Home
  • Work With Us
  • Contact
  • Web Stories
menu icon
go to homepage
  • All Recipes
  • Is It Keto
  • About us
    • Facebook
    • Instagram
    • Pinterest
    • YouTube
  • subscribe
    search icon
    Homepage link
    • All Recipes
    • Is It Keto
    • About us
    • Facebook
    • Instagram
    • Pinterest
    • YouTube
  • ×
    Home / Keto Marshmallows

    Keto Marshmallows

    Dom Lorenzo
    by Dom Lorenzo
    Updated: May 27,2025
    2 Comments
    Not yet rated

    Jump to Recipe Print Recipe

    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.

    An up-close shot of keto marshmallows.
    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!

    • Prep Time: 10 minutes
    • Cooking Time: 10 minutes
    • Setting Time: 2 hours
    • Total Time: 2 hours 20 Minutes
    • Difficulty Level: Easy
    • Recipe Makes 16 Servings
    Join the CastIronKeto email list

    Loading...

    Thank You for Subscribing.

    Ingredients for this Keto Marshmallow Recipe

    You only need simple ingredients to make keto marshmallows at home:

    • 3 tablespoons gelatin powder
    • ½ cup cold water, divided
    • 1 cup granulated allulose
    • 1 teaspoon pure vanilla extract
    • 1 pinch of sea salt

    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

    • Extra flavors: Add ½ teaspoon of peppermint, lemon, or your favorite extract at the last minute of whipping for a flavorful twist.
    • Natural food coloring: Use a few drops of natural coloring like beet juice or turmeric to add fun and vibrant hues to your marshmallows.

    Cooking Tools Required

    • Mixing bowl
    • Saucepan
    • Candy thermometer
    • 8x8 inch pan
    • Parchment paper
    • Spatula

    How to Make Keto Marshmallows: Step-by-Step Guide

    Cooking Methods

    • Boiling

    Preparation Steps

    1. Gather and measure all the ingredients.
    2. Line an 8x8 inch pan with parchment paper, leaving some overhang to easily lift out the marshmallows later.

    Cooking Instructions

    1. In a big mixing bowl, sprinkle the gelatin over ¼ cup (60ml) of cold water. Let it sit for 5 minutes to bloom.
    2. 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.
    3. Once the syrup reaches the desired temperature, carefully pour it into the bowl with the gelatin mixture. Start mixing on low speed.
    4. Gradually increase the speed to high and whip the mixture for 8-10 minutes, or until it becomes thick, fluffy, and tripled in volume.
    5. In the last minute of whipping, add the vanilla extract, salt, and any optional flavoring or food coloring.
    6. Pour the marshmallow mixture into the prepared pan, spreading it evenly with a spatula.
    7. Allow the marshmallows to set at room temperature for about 2 hours or until firm.
    8. 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

    • Sugar-free hot chocolate: Use the homemade marshmallows as a topping for sugar-free hot chocolate for a cozy, indulgent treat.
    • Keto Ice Cream: Pair them with a serving of keto ice cream for a chewy, sweet contrast.

    Storage Instructions

    • Store leftover marshmallows in an airtight container at room temperature for up to 5 days. Avoid refrigerating as it can change the texture.

    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

    Nope! Unlike traditional marshmallow recipes, allulose behaves differently than sugar. If you use the same ratio, you'll end up with tasty marshmallow fluff that will never set.

    Yes. Traditional marshmallows are loaded with sugar—that's what gives them their sweet taste and soft texture. A single serving will have around 15-25 grams of carbs.

    Sugar-free marshmallows are made with a mix of allulose (or another low-carb sweetener), gelatin, water, and flavoring like vanilla.

    Keto marshmallows can last up to 1-2 weeks when stored in an airtight container at room temperature. Just make sure they’re kept cool and dry to maintain that perfect texture!

    📖 Recipe

    An up-close shot of keto marshmallows.

    Keto Marshmallows

    Make these light, fluffy, and sugar-free Keto Marshmallows at home with just 3 simple ingredients—perfect for your favorite low-carb treats or snacking straight from the jar!
    No ratings yet
    Print Rate Pin Recipe
    Course: Dessert
    Cuisine: American
    Prep Time: 10 minutes minutes
    Cook Time: 10 minutes minutes
    Setting Time: 2 hours hours
    Total Time: 2 hours hours 20 minutes minutes
    Servings: 16
    Calories: 5kcal

    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!

    Nutrition

    Nutrition Facts
    Keto Marshmallows
    Amount Per Serving
    Calories 5
    % Daily Value*
    Fat 0.001g0%
    Saturated Fat 0.001g0%
    Monounsaturated Fat 0.001g
    Sodium 5mg0%
    Potassium 1mg0%
    Carbohydrates 13g4%
    Sugar 0.03g0%
    Protein 1g2%
    Calcium 1mg0%
    Iron 0.01mg0%
    *

    Nutritional values are estimates only and do not include carbs from sugar alcohols.

    # Hashtag with us!Don't forget to mention @castiron_keto or tag #castironketo on Instagram with your creations! We love seeing what you're making.
    « Keto Cheesecake Recipe
    Keto Cream Cheese Glaze »

    Reader Interactions

    Comments

    1. Sharon says

      March 22, 2025 at 9:46 pm

      Can you dip these in melted chocolate for chocolate covered marshmallow Eggs.?

      Reply
      • Cast Iron Keto says

        March 25, 2025 at 11:16 pm

        Hi Sharon,

        Absolutely! Just dip them in melted sugar-free chocolate, let them set in the fridge, and enjoy!

        Reply

    Leave a Reply Cancel reply

    Your email address will not be published. Required fields are marked *

    Recipe Rating




    Primary Sidebar

    cast iron keto logo

    Cast Iron Keto publishes tasty low-carb gluten-free recipes all made in cast-iron cookware. We hope you find something you love!

    More about us →

    Trending Recipes

    • keto stuffed peppers in a cast iron skillet
      Keto Stuffed Peppers (Classic Recipe) 🫑
    • Keto Burger on a upside down sheet pan with tomatoes in the background
      Keto Burger - In-N-Out Style 🍔
    • Keto Cheesy Cabbage Sausage Skillet on tabletop
      Keto Cheesy Cabbage Sausage Skillet 🥘
    • Keto Sloppy Joe mixture in a cast iron skillet with a serving spoon
      Keto Sloppy Joes (Skillet Style) 🥘
    • Keto Butter Chicken in a cast iron skillet with cauliflower rice
      Keto Butter Chicken (Easy 30 Minutes Recipe) 🥘
    • Keto Pork Tenderloin in cast iron skillet
      Keto Pork Tenderloin with Garlic Herb Butter 🥩

    Footer

    CastIronKeto

    Subscribe

    Subscribe to our newsletter and get all of the latest news and updates.

    QUICK LINKS

    • Keto Recipes
    • Keto Friendly Foods Database
    • Web Stories
    • Cookbook
    • Privacy Policy
    • Accessibility Policy

    ABOUT

    • Contact Us
    • About Us
    • Work With Us
    • Sitemap
    • Pinterest
    • nofollow
    • Instagram
    • YouTube

    As an Amazon associate, We earn from qualifying purchases.

    © 2025 Castironketo. All Rights Reserved.

    Join the CastIronKeto email list

    Loading...

    Thank You for Subscribing.

    Rate This Recipe

    Your vote:




    A rating is required
    A name is required
    An email is required