Marshmallow cold foam is just sweetened cream whipped to a thick, glossy froth with marshmallow flavor folded in. You can make a better one at home in five minutes than any bottle at the store. The trick is a steady ratio of heavy cream to marshmallow flavor and a cheap handheld frother, not a special machine. Get that ratio right and it floats on top of iced coffee like a soft cloud, sweet and a little smoky.
Last updated: 2026-07-23
Toasted Marshmallow Cold Brew
Ingredients
Method
- Prepare Cold Brew: Mix 1 1/2 cups of medium roast coffee grounds with 3 cups of room temperature water. Let it steep for 18 hours, then strain to get a smooth concentrate.
- Mix Ingredients: In a glass, combine 16 ounces of cold brew with 1 tablespoon of toasted marshmallow syrup.
- Add Milk and Cream: Stir in 1 tablespoon of milk and 3 tablespoons of heavy cream for a creamy texture.
- Optional Toppings: Add coffee chocolate or other toppings if desired.
- Serve: Enjoy your homemade toasted marshmallow cold brew.
Notes
What Is Marshmallow Cold Foam, Exactly?
Marshmallow cold foam is cold, lightly whipped cream flavored to taste like a toasted marshmallow. It is not a proprietary product you have to hunt down at a chain. It is a topping, and the base is the same froth baristas float over any cold coffee.
The marshmallow part comes from one of three things: marshmallow fluff, a bottled syrup, or homemade toasted marshmallow puree. All three work. They just taste and pour a little differently, which I break down below.
Because you whip it cold, it stays thick and holds its shape instead of dissolving into the coffee. That slow melt down the side of the glass is the whole point. It tastes like a s'more without the campfire mess.
Gear and Ingredients for a Good Batch
Three things carry this recipe: cold heavy cream, a splash of milk, and your marshmallow flavor. That is it. I use 3 tablespoons of heavy cream to 1 tablespoon of milk and 1 tablespoon of marshmallow flavoring. That whips into enough foam for one tall coffee.
You also need a handheld milk frother. It costs about the price of a coffee-shop drink and does the job in under a minute. A small, thin glass helps too, because the froth builds thicker in a narrow space than a wide bowl.
Pick your marshmallow flavor by how much effort you feel like spending, because all three float the same. The only real difference is in the taste:
| Flavoring | Tastes like | Best for |
|---|---|---|
| Marshmallow fluff | Soft, sugary, classic | A quick, cheap fix from the pantry |
| Toasted marshmallow syrup | Sweet with a smoky edge | Pourable ease and consistent flavor |
| Homemade toasted puree | Deep, campfire, browned sugar | The richest, most s'mores-like cup |
Any of these gets you there. Fluff is the cheap fix if you already have a jar.
How to Whip It, Step by Step
Whip the cold cream, milk, and marshmallow flavor together with a handheld frother until it doubles and turns thick. Then spoon or pour it over your iced coffee. That is the entire method, and it takes about a minute of frothing. Stop when it holds a soft peak, before it stiffens like whipped cream.
Keep everything cold. Cream whips faster and holds longer straight from the fridge. If your foam looks loose and watery, it warmed up or you stopped too soon.
Pour it slowly so it floats. A fast dump sinks it into the coffee. For a topping, drop a few toasted marshmallow flakes on top for texture. The step-by-step amounts and timing live in the recipe card below.
Making the Toasted, S'mores Version
For toasted marshmallow cold foam, swap the plain flavor for a toasted version. You get that smoky, browned-sugar note that tastes like a real s'more. The easiest route is a bottle of toasted marshmallow syrup. I reach for Torani Toasted Marshmallow Syrup, which comes in a 750ml glass bottle and pours smoky and sweet without any fuss.
Want it deeper still? Toast a few marshmallows under the broiler until they blister and go golden, then blend them into the cream before frothing. It is messier, but the campfire flavor is stronger than any syrup.
This combo shines over cold brew. If you love it, my toasted marshmallow cold brew recipe leans into the same s'mores flavor. For the coffee underneath, mix 1 part concentrate with 2 parts cold water so the cream has something strong to sit on.
Can Marshmallow Cold Foam Work as a Coffee Creamer?
Yes, and it is one of my favorite uses for it. To turn foam into a pourable creamer, add more milk and skip the long whip. Loosen the ratio so it flows off a spoon instead of holding a peak.
A quick froth still helps here. It gives the creamer a light, airy body without making it stiff. Then stir it right into hot or iced coffee like any homemade coffee creamer.
The flavor stays the same, sweet and smoky, but it spreads through the whole cup instead of sitting on top. Use the thick version when you want a floating cloud. Use the thinned version when you want every sip to taste like marshmallow.
The Ratio That Gives the Best Texture
Fat is what holds the foam, so use heavy cream, not milk alone, as your base. My reliable mix is 3 tablespoons of heavy cream to 1 tablespoon of milk. The cream gives structure, and the small splash of milk keeps it from whipping too stiff.
Half-and-half works if that is what you have, but it stays looser and melts faster. Skim or low-fat milk will not hold at all. There simply is not enough fat to trap the air.
Keep the marshmallow flavor to about 1 tablespoon per serving. More than that and the sugar weighs the foam down and softens it. Stay near that tablespoon and the foam keeps its body.
Mistakes That Flatten Your Foam
Over-whipping is the most common way people wreck this. Push the frother too long and the cream stiffens into butter-bound clumps that plop instead of pour. Stop the second it holds a soft peak.
The other big miss is warm cream. Room-temperature cream whips thin and collapses within a minute. Pull it straight from the fridge and, on a hot day, chill the glass too.
A few more things that trip people up:
- Too much syrup. The extra sugar loosens the foam and drowns the coffee.
- Low-fat milk instead of cream. No fat, no foam.
- A wide bowl. Froth builds thicker in a small, thin glass.
- Pouring fast. Dump it and it sinks. Pour slow and it floats.
Fix one thing at a time so you know which change actually worked.
Storing and Reviving Leftovers
Store leftover foam in a sealed jar in the fridge and use it within a couple of days. It will deflate as it sits, which is normal. The fat and air separate once the froth relaxes.
Do not try to save it as foam. Instead, give it a quick re-froth right before you pour it again. A few seconds with the handheld wand brings back most of the body.
If it has gone too flat to revive, stir it into hot coffee as a creamer. Nothing wasted. Honestly, this recipe is easy enough that I just whip a fresh batch each time, since it takes about a minute.
FAQ
Can I make marshmallow cold foam without a frother?
Yes. Drop the cold cream, milk, and marshmallow flavor into a mason jar, seal it tight, and shake for 30 to 45 seconds until it thickens. It will not get quite as fine as a frother's foam, but it floats just fine over iced coffee.
Which coffee works best under marshmallow cold foam?
A strong, smooth cold brew. I like a sweeter, low-acid grind such as Bizzy Smooth Sweet Organic Cold Brew. Its 1-pound bag brings sweet, caramel, and hazelnut notes that play well with marshmallow. Steep the grounds for about 16 hours so the concentrate has enough body to hold the foam up.
Can I make a dairy-free marshmallow cold foam?
You can, with a trade-off. Cold oat milk plus a splash of oat cream will froth, but it stays looser than heavy cream and deflates sooner. Add the same marshmallow flavor and re-froth right before serving to keep it lively.
Is marshmallow cold foam very sweet?
It is sweet, but you control it. One tablespoon of marshmallow flavor per serving lands sweet without being cloying, especially over strong, slightly bitter cold brew. If you want it toned down, cut the flavoring back and let the coffee lead.
What else can I top with this foam?
Anything cold and coffee-based. It is lovely on iced lattes, and it fits right in with other cold-weather drinks like a cozy winter coffee or a spiced cold brew. Toasted marshmallow flakes or a dusting of cocoa on top make it look and taste like dessert.
Related: Apricot Vanilla Cold Brew Recipe
