How to Make Homemade Toasted Marshmallow Syrup

This Homemade Toasted Marshmallow Syrup recipe for coffee is about to become your new favorite thing! It’s sweet, slightly smoky, and loaded with that gooey marshmallow flavor you just can’t buy in a bottle. The best part? You only need a handful of pantry staples and a few minutes under the broiler to make it happen.

This syrup isn’t just for coffee either! You can drizzle it over pancakes, swirl it into hot chocolate, shake it into cocktails or mocktails, or pour a splash into a milkshake when you’re feeling extra fancy. It’s cheaper than store-bought syrups, totally customizable, and makes any drink or dessert feel instantly festive. If you’ve ever wished your morning latte tasted like a cozy campfire, you need this syrup in your life.

Since you are here and love the flavor of toasted marshmallows, check out this 3-Ingredient Creme Brulee with Ice Cream, this Chocolate Covered Marshmallows Recipe, this Starbucks Iced Toasted Vanilla Shaken Espresso Copycat Recipe, these Easy Brown Butter Pecan Chocolate Chip Cookies, or this Creamy White Hot Chocolate.

Ingredients for this Homemade toasted marshmallow syrup recipe

Here are the ingredients you will need to make this homemade syrup. Scroll down to the recipe card at the bottom of the page for the detailed ingredient measurements. 

Water: dissolves the sugar into a simple syrup base.

Granulated Sugar: adds sweetness and helps thicken the syrup as it cooks.

Mini Marshmallows: provide the toasted marshmallow flavor and gooey texture.

Vanilla Extract: enhances the marshmallow flavor.

Pinch of Salt: balances the sweetness and brings out all the other flavors.

How to make a Homemade toasted marshmallow syrup recipe

This is how you can make this simple syrup recipe. Make sure to scroll down to the recipe card at the end of this post for the full step-by-step instructions! 

1. Preheat your oven to broil on high.
2. Line a baking sheet with parchment paper or foil and spread the mini marshmallows out in a single layer.
3. Broil for 1–2 minutes, keeping a close eye on them, until they’re golden brown and perfectly toasty.
4. In a small saucepan, combine the water and sugar.
5. Gently boil over medium heat, stirring occasionally, until the sugar dissolves fully.
6. Stir the toasted marshmallows into the syrup base.
7. They’ll puff up and begin to melt, but keep stirring until they’re mostly smooth and well incorporated.
8. Stir in the vanilla extract and a small pinch of salt to enhance that toasted marshmallow flavor.
9. Let the syrup continue to simmer to thicken slightly.
10. For a silky-smooth syrup, pour it through a fine mesh strainer. Or, skip this step if you like some of those burnt pieces of marshmallow texture.
11. Let the hot syrup cool down completely to room temperature.
12. Transfer to a jar or bottle and place in the refrigerator.

Why do you need to make this toasted marshmallow coffee syrup recipe?

• It’s made with only simple ingredients that mostly likely already have in your pantry.
• This toasted marshmallow syrup is a great way to enhance a variety of drinks!
• Iced coffee lovers should use it to boost their morning coffee.
• Add it to a hot cocoa to make it a s’mores-like treat.
• You can create unique cocktails like a campfire margarita or s’mores martinis.

Frequently asked questions – FAQ

How much do I use for one serving?

To use, 2-3 tablespoons should be enough to flavor your iced coffees or lattes. Of course, it depends on the size of the drink and your sweet tooth. You can always add more if you want.

Can I use regular-sized marshmallows instead of mini?

Yes! Just cut or tear them into smaller pieces so they toast and melt more evenly. Or you can roast them over the burner of a gas stove using a metal skewer. Just make sure to be careful if do this.

Can I use marshmallow fluff as a substitute for actual marshmallows?

Yes you can, but I still suggest broiling or torching it first. Also, fluff is slightly sweeter, so you may want to reduce the sugar in the recipe slightly to prevent the syrup from becoming overly sweet.

Can I make this without broiling the marshmallows?

You can melt them directly into the sugar-water mixture, but you’ll lose out on flavor and it won’t be a toasted marshmallow syrup. Broiling is what gives the nostalgic flavor of a toasted marshmallow that takes this syrup to the next level.

How do I store leftovers?

Keep it in an airtight container like a mason jar or a squirt bottle with a cap for up to a week or so. It should stay fresh as long as you keep out the fridge air.

Can I freeze toasted marshmallow syrup?

Yes! You can freeze it in an ice cube tray for individual serving amounts or in an airtight container for up to 2 months. Thaw in the fridge before using or just pour hot milk and espresso over it to melt it quickly.