Name: Marshmallow Swirl Fudge
Prep time: 10 min
Cook time: PT-488375H55M45S
Total time: 2 h 10 min
Cuisine: American
Ingredients: 2 cups semi‑sweet chocolate chips; 1 (14 oz) can sweetened condensed milk; 2 tbsp unsalted butter, melted; 1 tsp vanilla extract; ¼ tsp salt; 1 cup marshmallow fluff (or cream)

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If I’m craving something rich, chocolatey, and ridiculously easy to make, this Marshmallow Swirl Fudge is always my go-to. It’s the kind of dessert that melts in my mouth with every bite—soft, creamy fudge filled with thick, gooey ribbons of marshmallow. Best of all, it comes together without a candy thermometer, no baking, and only a handful of ingredients.

I like that it’s impressive enough for a party tray but simple enough to whip up on a lazy evening. Let me show how I make it!

Why You’ll Love This Recipe

I love how this fudge combines two nostalgic flavors—chocolate and marshmallow—into one bite-sized treat. Here’s why I keep making it over and over again:

No baking or fancy tools needed
Ultra-creamy texture with gooey swirls of marshmallow
Only 6 basic ingredients
Perfect for holidays, gifting, or snacking
Easily customizable with mix-ins or toppings

Ingredients

(Here’s a tip: Check out the full list of ingredients and measurements in the recipe card below.)

2 cups semi-sweet chocolate chips
1 can (14 oz) sweetened condensed milk
2 tbsp unsalted butter, melted
1 tsp vanilla extract
¼ tsp salt
1 cup marshmallow fluff (or marshmallow cream)

Directions

Melt the chocolate
In a medium saucepan over low heat, I melt the chocolate chips, sweetened condensed milk, and butter. I keep stirring until everything is smooth and glossy.
Add vanilla and salt
I take the saucepan off the heat, then stir in the vanilla extract and salt until it’s fully blended in.
Pour into pan
I line an 8×8-inch baking dish with parchment paper and spread the chocolate fudge mixture evenly across the bottom.
Swirl in the marshmallow
I drop spoonfuls of marshmallow fluff on top, then use a knife to gently swirl it through the fudge. I try not to overmix—it looks best with thick, visible ribbons.
Chill and set
I pop the dish in the fridge for at least 2 hours, letting it set completely until firm.
Cut and serve
Once it’s chilled, I lift the fudge out using the parchment, slice it into squares, and enjoy every gooey bite.

Servings and timing

This recipe makes about 16 squares of fudge. It takes around 10 minutes of prep time and 2 hours to chill and set. No baking time required!

Variations

Dairy-free version: I swap the chocolate and sweetened condensed milk for dairy-free alternatives.
Extra chocolatey: I like adding ½ cup chopped dark chocolate to the mix for a deeper cocoa flavor.
Crunchy twist: Chopped nuts or crushed cookies give it a bit of texture.
S’mores-inspired: I layer a graham cracker crust under the fudge before pouring it in. Bonus points for toasting the marshmallow top!

storage/reheating

I store the fudge in an airtight container in the fridge—it stays fresh for up to 1 week. If I want to keep it longer, I freeze it in a sealed container for up to 3 months, then thaw before serving. There’s no need to reheat—just let it come to room temp if it’s a bit too firm from the fridge.

FAQs

How do I get clean slices when cutting the fudge?

I use a sharp knife and wipe it clean between each cut. Sometimes I run it under hot water to help slice more smoothly.

Can I use mini marshmallows instead of fluff?

I’ve tried it, but marshmallow fluff works better. Mini marshmallows tend to melt into the fudge and disappear instead of creating swirls.

Is this recipe gluten-free?

Yes! Just make sure the chocolate chips and marshmallow fluff are certified gluten-free if needed.

Can I double the recipe?

Definitely. I use a 9×13-inch pan for a double batch, and it sets just as nicely.

How do I toast the top for a s’mores effect?

Once I’ve swirled in the marshmallow, I use a kitchen torch to lightly toast the surface. It adds a delicious caramelized flavor.

Conclusion

This Marshmallow Swirl Fudge is everything I want in a quick dessert—rich, indulgent, and incredibly easy. Whether I’m making it for the holidays, sharing with friends, or just treating myself, it never disappoints. Give it a try, and enjoy that perfect swirl of chocolate and marshmallow in every bite.