Cold brew is already smooth and mellow, but add marshmallow and it turns into a treat that’s part coffee, part dessert. This Marshmallow Cold Brew brings toasted marshmallow flavor, silky texture, and just the right hint of sweetness. It’s easy to make at home and way kinder on your wallet than a café version.

You can prep the coffee in advance, then finish it in minutes when you’re ready to sip. Whether you like it light and fluffy or bold and coffee-forward, this recipe is flexible and fun.

Why This Recipe Works

Close-up detail: Marshmallow whipped cream cascading over a glass of prepared Marshmallow Cold Brew,

Cold brew extracts coffee slowly, which keeps bitterness low and makes room for soft, sweet flavors like marshmallow to shine. By using a simple marshmallow syrup and a whipped marshmallow cream, you get both flavor and texture without clumping or uneven sweetness.

The recipe also layers cold brew, syrup, milk, and cream in a way that blends smoothly and stays stable over ice. Best of all, you can customize every part: the roast level, the sweetness, and the dairy. It’s a café-style drink that’s easy to pull off at home with grocery-store ingredients.

What You’ll Need

Cold brew concentrate (homemade or store-bought), about 1 cup
Ice, enough to fill your glass
Milk or dairy alternative (whole milk, oat, almond, or coconut), 1/2 to 3/4 cup
Marshmallows, 1 cup mini or 8 regular
Sugar, 1/3 cup (for syrup)
Water, 1/2 cup (for syrup)
Vanilla extract, 1 teaspoon
Salt, a small pinch (to balance sweetness)
Heavy cream, 1/2 cup (for whipped topping) or coconut cream for dairy-free
Optional: Graham cracker crumbs or cocoa powder for garnish

How to Make It

Cooking process: Toasted marshmallows just melted into a glossy marshmallow syrup in a small saucepa

Brew the coffee. If making cold brew at home, combine 1 cup coarsely ground coffee with 4 cups cold water.
Stir, cover, and steep 12–18 hours in the fridge. Strain through a fine mesh or coffee filter. You’ll have a smooth concentrate ready for mixing.
Toast the marshmallows (optional but worth it). Set marshmallows on a parchment-lined tray.
Use a kitchen torch to lightly toast them until golden, or broil on high for 30–60 seconds, watching closely. Toasting deepens the marshmallow flavor and adds a subtle caramel note.
Make marshmallow syrup. In a small saucepan, combine water and sugar over medium heat. Stir until the sugar dissolves and simmers.
Add the marshmallows and stir until melted and smooth. Remove from heat, add vanilla and a pinch of salt, and let it cool. The syrup will thicken slightly as it rests.
Whip the cream. In a chilled bowl, whip heavy cream to soft peaks.
Fold in 1–2 tablespoons of the cooled marshmallow syrup for flavor. You’re aiming for a fluffy topping that still pours slowly.
Build the drink. Fill a tall glass with ice. Add 1/2–1 ounce of marshmallow syrup (start small; it’s sweet).
Pour in 1/2 cup cold brew concentrate and 1/2 cup milk. Stir gently to combine and taste. Adjust with more syrup or more coffee as needed.
Top and finish. Spoon or pour the marshmallow whipped cream over the drink.
Sprinkle with graham cracker crumbs or a dusting of cocoa powder if you like a s’mores vibe.
Serve. Add a straw and give it a quick stir as you sip so the cream swirls into the coffee. It should be sweet, creamy, and still clearly coffee.

Keeping It Fresh

Cold brew concentrate keeps well in the fridge for up to one week in a sealed jar. The marshmallow syrup lasts 1–2 weeks refrigerated in a squeeze bottle or lidded container; give it a quick stir if it separates.

Whipped marshmallow cream is best the same day, but you can re-whip gently if it softens. Store the components separately and assemble just before serving for the best texture and flavor. If you batch this for guests, keep the syrup and cream chilled on ice so they don’t slump.

Tasty top view: Overhead shot of the final Marshmallow Cold Brew built over ice—distinct layers of

Benefits of This Recipe

Budget-friendly. A few pantry staples create a coffeehouse-style drink for a fraction of the price.
Customizable sweetness. You control the amount of syrup, so it never turns cloying.
Smoother than iced coffee. Cold brew’s low acidity pairs naturally with creamy, dessert-like flavors.
Great for crowds. Batch the concentrate and syrup ahead; assemble to order.
Flexible for diets. Easy dairy-free swaps keep the flavor intact.

What Not to Do

Don’t skip the pinch of salt. It won’t make the drink salty; it rounds out the sweetness and brings out the coffee.
Don’t over-sweeten upfront. Marshmallow syrup is potent.
Start with less and add more after tasting.
Don’t use finely ground coffee for cold brew. It over-extracts and turns muddy. Use a coarse grind for clarity and smoothness.
Don’t pour hot syrup into cold milk. Let the syrup cool, or it can curdle some milks and melt your ice.
Don’t whip the cream to stiff peaks. You want a soft, sippable layer that blends into the drink.

Alternatives

No-torch option. Skip toasting and add a drop of caramel or toasted sugar syrup to mimic that roasted note.
Dairy-free version. Use oat or almond milk. For topping, whip chilled coconut cream with marshmallow syrup.
Simple syrup swap. If you don’t want to melt marshmallows, make vanilla simple syrup (equal parts sugar and water plus vanilla) and add a splash of marshmallow flavor extract.
Protein boost. Blend 1–2 tablespoons vanilla protein powder with milk before adding to the glass.
Keep the syrup light to avoid over-sweetness.
Decaf-friendly. Use decaf beans for the cold brew and enjoy the same flavor without the buzz.
Hot-day shortcut. Use store-bought cold brew and jarred marshmallow crème: thin a spoonful with a bit of milk to create an instant topping.

FAQ

Can I use regular iced coffee instead of cold brew?

Yes, but expect more acidity and a sharper edge. If using iced coffee, add a little extra milk and a touch more syrup to balance. Cold brew’s smoothness is what makes this drink shine, though.

How strong should the cold brew concentrate be?

A typical ratio is 1:4 coffee to water for concentrate.

When mixing the drink, aim for a 1:1 ratio of concentrate to milk and ice combined, then adjust to taste. If your concentrate is very strong, dilute slightly before building the drink.

Can I use marshmallow fluff instead of making syrup?

You can, but it’s very thick. Warm a spoonful with a splash of hot water to thin it into a drizzle.

It won’t be as smooth as syrup, but it works in a pinch and tastes great in the whipped topping.

What coffee beans work best?

Medium or medium-dark roasts with chocolate, caramel, or nutty notes complement marshmallow flavors. Very light roasts can taste too bright here, while very dark roasts may overpower the sweetness.

How do I make it less sweet?

Reduce the syrup to 1/4–1/2 ounce and keep the whipped topping unsweetened. You can also swap part of the milk for more cold brew to increase the coffee presence.

Can I make it vegan?

Yes.

Use plant milk and coconut cream for the topping. For the syrup, check that your marshmallows are vegan (many contain gelatin), or use vanilla syrup with a vegan marshmallow flavoring.

How can I add a s’mores twist?

Rim the glass with crushed graham crackers by brushing the rim with a little syrup and dipping it into crumbs. Add a light dusting of cocoa powder over the whipped topping and finish with a mini toasted marshmallow on a cocktail pick.

Does it work without any topping?

Absolutely.

Stir the marshmallow syrup directly into the cold brew and milk, add ice, and serve. The whipped cream adds texture, but the flavor stands on its own.

Final Thoughts

Marshmallow Cold Brew is the kind of drink that makes your coffee break feel special without demanding barista-level skills. With a simple syrup, a soft whipped topping, and smooth cold brew, it hits that sweet spot between treat and everyday sip.

Keep the components on hand, tweak the sweetness to your taste, and make it your signature summer coffee. It’s playful, refreshing, and surprisingly easy to master at home.