Fondant Icing Recipe With Marshmallows: Silky Smooth Frosting Without the Powdered Sugar

This marshmallow-based fondant icing offers a silky smooth alternative to traditional powdered sugar versions. The process transforms simple ingredients into a professional-quality frosting.

With its versatile consistency and clean flavor, this icing works perfectly for covering cakes or creating intricate decorations. Storage is simple—keep it sealed and at room temperature.

Ingredients for Fondant Icing Recipe with Marshmallows

Transform simple ingredients into professional-grade frosting with this marshmallow-based approach to smooth fondant.

The marshmallows are crucial here. Jet-Puffed mini marshmallows melt most evenly—avoid stale ones as they won’t incorporate smoothly. Domino or C&H granulated sugar dissolves cleanly without residue. For the corn syrup, Karo light is the standard, but any clear corn syrup works. The vanilla should be pure extract (not imitation) for clean flavor that won’t compete with the marshmallow base.

No corn syrup? Honey or agave can substitute but may alter texture slightly. Skip the shortening if avoiding fats, though the fondant may be less elastic. For coloring, gel-based food colorings won’t throw off the consistency like liquid dyes. The salt is essential—don’t omit it—as it balances the sweetness and enhances all other flavors.

Store in an airtight container at room temperature for up to 2 weeks. For longer storage, wrap tightly in plastic and refrigerate for 1 month. Knead briefly before use if it stiffens—this revives the smooth, workable texture.

Step-by-Step Instructions for Fondant Icing With Marshmallows

This method ensures a smooth, pliable fondant with professional results every time.

Step 1: Melt the Mini Marshmallows With Wet Ingredients

In a microwave-safe bowl, combine the 4 cups Mini Marshmallows, 0.25 cup Water, and 2 tbsp Light Corn Syrup. Microwave on high power for 30-second intervals, stirring between each, until the marshmallows are fully melted and smooth.

This typically takes 1.5 to 2 minutes total. The mixture should be glossy and free of lumps. The corn syrup prevents sugar crystallization, ensuring your fondant stays silky. Avoid overheating, as it can make the marshmallows bitter or cause the mixture to seize.

Step 2: Incorporate Dry Ingredients and Flavorings

Once melted, stir in the 1 cup Granulated Sugar, 0.25 tsp Salt, and 2 tsp Vanilla Extract. The sugar provides structure, while the salt balances sweetness. The vanilla adds depth, so use pure extract for the best flavor.

Mix thoroughly until the granulated sugar is fully dissolved. You’ll notice the mixture thicken slightly as the sugar integrates. Ensure no grains remain—this prevents a gritty texture in the final fondant.

Step 3: Add Vegetable Shortening for Elasticity

Now, incorporate the 2 tbsp Vegetable Shortening in 1-tablespoon increments, mixing well after each addition. The shortening gives the fondant its signature stretch and sheen, making it easier to roll and drape.

Work the mixture with a silicone spatula, pressing it against the sides of the bowl to fully incorporate the shortening. The fondant will become glossy and slightly tacky, which is ideal for handling.

Step 4: Knead and Tint the Fondant

Lightly grease your work surface with a small amount of additional shortening to prevent sticking. Turn out the fondant and knead it for 3-5 minutes until smooth and pliable. If using the 0.5 tsp Gel Food Coloring, add it during kneading to achieve an even tint.

The fondant should feel soft and elastic, like Play-Doh, but not sticky. If it sticks to your hands, dust them with a bit more shortening. Proper kneading ensures uniform color and texture, so don’t rush this step.

Step 5: Rest and Store for Optimal Use

Wrap the fondant tightly in plastic wrap and let it rest at room temperature for 20-30 minutes before using. This resting period allows the ingredients to fully bind, making the fondant easier to roll out.

For longer storage, place the wrapped fondant in an airtight container. It will keep at room temperature for up to 2 weeks or in the refrigerator for 1 month. Bring it to room temperature before rolling for best results.

Storing and Reheating This fondant icing recipe with marshmallows

🍳 Refrigerator Storage

To keep your marshmallow fondant icing fresh, store it in an airtight container at room temperature for up to 3-4 days. If your kitchen is warm or humid, refrigeration can extend its shelf life. Just ensure the container is sealed tightly to prevent drying or absorbing odors.

❄️ Freezer Storage

For longer storage, wrap the fondant icing tightly in plastic wrap, then place it in a freezer-safe bag or container. It can last 2-3 months in the freezer. To avoid freezer burn, squeeze out excess air before sealing.

🔥 Reheating Methods

If your fondant hardens, gently warm it in the microwave in 5-10 second bursts on low power, stirring between intervals. For larger batches, use a double boiler on the stovetop at low heat until soft and pliable. Avoid high heat to prevent melting the marshmallows.

✨ Quality Preservation

To maintain texture, store fondant in a cool, dry place away from direct sunlight. If frozen, thaw it in the refrigerator overnight before reheating. For extra smoothness, knead a bit of shortening into the fondant after thawing. This keeps it soft and workable for decorating!