Marshmallow Hot Fudge Sauce That's Better Than Any Ice Cream Shop

This marshmallow hot fudge sauce takes the classic chocolate sundae topping and stirs in marshmallow creme for a texture that stays soft and stretchy even after it cools. It clings to ice cream instead of hardening, stays scoopable straight from the fridge, and comes together in about ten minutes with pantry staples. No candy thermometer, no special equipment, just a saucepan and a spoon.

Why Marshmallow Makes It Better

Traditional hot fudge is wonderful, but it can set up quite firm once it hits cold ice cream. Adding marshmallow creme changes the whole experience. The marshmallow adds a soft chewiness and a subtle vanilla sweetness that plays off the deep chocolate without competing with it. The sauce stays glossy and pourable even after refrigerating overnight, which means leftover sundae nights are just as good as the first one. It also has a slightly lighter body than straight fudge sauce, so it drapes over a scoop rather than pooling at the bottom of the bowl.

What You Need

The ingredient list is short and forgiving. Here is what goes into the pot:

1 cup semi-sweet chocolate chips 1/2 cup heavy cream 1/4 cup unsalted butter, cut into pieces 1/2 cup marshmallow creme (like Jet-Puffed Marshmallow Fluff) 1/4 cup granulated sugar 2 tablespoons light corn syrup 1 teaspoon vanilla extract Pinch of fine sea salt

The corn syrup keeps the sauce smooth and prevents any graininess in the chocolate. You can swap dark chocolate chips for a more intense flavor, or use milk chocolate if you are making this for kids who prefer a sweeter, milder sauce. Marshmallow creme and marshmallow fluff are basically the same thing and either works here.

How to Make Marshmallow Hot Fudge Sauce

Start by combining the heavy cream, butter, sugar, and corn syrup in a medium saucepan over medium heat. Stir gently as the butter melts and the sugar dissolves. Once everything is combined and just starting to bubble at the edges, remove the pan from the heat.

Add the chocolate chips all at once and let them sit for about sixty seconds without stirring. Then stir slowly from the center outward until the chocolate is completely melted and the mixture looks glossy and uniform. If a few chips are stubborn, return the pan to the lowest heat setting for thirty seconds and stir again.

Add the marshmallow creme, vanilla, and salt. Stir until the marshmallow is fully incorporated. It will look a little streaky at first but keep going, it smooths out completely within a minute of stirring. The sauce is ready when it coats the back of a spoon and falls in a thick ribbon.

Transfer to a jar or heatproof pitcher and let it cool for five minutes before serving. It will thicken slightly as it sits.

Serving Ideas

The obvious move is spooning it generously over vanilla ice cream, but this sauce works on so much more than a basic sundae. Drizzle it warm over a brownie before adding a scoop on top. Use it as a dipping sauce for churros or pretzel rods at a party. Swirl it into a milkshake for a fudge ribbon effect. Spread it between cake layers the way you would a ganache. Warm a spoonful and stir it into hot coffee for a mocha that tastes like it came from a real cafe.

For a full sundae bar situation, set out the warm sauce alongside caramel sauce, whipped cream, chopped nuts, and cherries. This sauce is the kind of thing that makes guests ask if you bought it somewhere special.

Storage and Reheating

Pour any leftover sauce into a glass jar with a tight lid and refrigerate for up to two weeks. It will firm up in the fridge, which is expected. To reheat, scoop out however much you need into a small microwave-safe bowl and heat in 20-second intervals, stirring between each one, until it reaches a pourable consistency. It usually takes about 40 to 60 seconds total depending on the quantity.

You can also reheat a full jar by setting it in a bowl of hot tap water for ten minutes and stirring occasionally. This is a good option if you are serving a crowd and want to keep the sauce warm in a small slow cooker or fondue pot throughout the meal.

Do not freeze this sauce. The marshmallow component does not thaw cleanly and the texture becomes grainy and separated.

Tips for Getting It Right

Do not rush the chocolate melting step. Pulling the pan off the heat before adding the chips and letting them sit first prevents scorching and gives you a smoother result than stirring chips directly into bubbling liquid.

Use room temperature marshmallow creme if possible. Cold creme straight from the fridge can be stiff and take longer to incorporate, which sometimes causes the sauce to look lumpy before it smooths out.

If your sauce ends up thicker than you want, whisk in heavy cream one tablespoon at a time over low heat until you reach the right consistency. If it is too thin, let it simmer on low for an extra two to three minutes, stirring constantly.

The salt is not optional. Even a small pinch sharpens the chocolate flavor noticeably. Flaky sea salt on top of the finished sundae is a great finishing touch too.

Frequently Asked Questions