Chocolate Marshmallow Swirl Cookies
Rich, gooey chocolate cookies swirled with melted marshmallows. Learn the science of preventing marshmallow evaporation for perfect bakery-style pools.
- High-fat cocoa dough prevents the cookie from drying out while baking.
- Strategic chilling slows down the marshmallow melting rate to prevent evaporation.
- Tearing the marshmallows creates gorgeous, bakery-style caramelized pockets.
I once vaporized an entire bag of marshmallows.
I had foolishly stuffed them straight into the center of a warm chocolate dough, expecting a gorgeous, gooey pull, but they melted into carbonized black puddles on my baking sheet instead.
It was a sticky, depressing disaster.
The science behind this vanishing act is simple: marshmallows are mostly sugar and air, meaning dry oven heat vaporizes their water content, liquefying the sugar until it boils right out of the dough's protein matrix. To prevent this, we must use a high-fat cocoa base and chill the assembled dough balls until they are absolutely rock-solid before baking.
This simple temperature control keeps the marshmallow intact just long enough to brown beautifully without escaping.
If you love decadent bakes like my cheesecake stuffed chocolate chip cookies, you know that stuffing a cookie requires a bit of patience and a lot of structural support.
While I love a classic chocolate chip cookie, there is something undeniably dramatic about a molten marshmallow core.
If you prefer a cookie where the marshmallow is completely integrated into the dough rather than stuffed, try my Double Chocolate Marshmallow Cookies.
It is pure baking magic.
Chocolate Marshmallow Swirl Cookies
Ingredients
- 115g unsalted butter, melted and cooled slightly
- 150g light brown sugar, packed
- 50g granulated sugar
- 1 large egg, room temperature
- 1 tsp vanilla extract
- 150g all-purpose flour
- 40g Dutch-process cocoa powder
- 1/2 tsp baking soda
- 1/2 tsp Diamond Crystal kosher salt
- 100g semi-sweet chocolate chips
- 6 large marshmallows, cut in half horizontally
Directions
- In a large bowl, whisk the melted butter, brown sugar, and granulated sugar until fully combined and no lumps remain.
- Add the egg and vanilla extract, whisking vigorously for about one full minute until the mixture lightens in color and thickens slightly.
- Sift in the all-purpose flour, Dutch-process cocoa powder, baking soda, and kosher salt, then fold with a spatula until just combined.
- Gently fold in the chocolate chips until evenly distributed throughout the rich chocolate dough.
- Divide the dough into 12 equal portions, flatten each slightly, place a marshmallow half in the center, and wrap the dough completely around it, sealing any seams.
- Place the stuffed dough balls on a tray and freeze for at least 2 hours (do not skip this step, or the marshmallows will melt completely).
- Preheat your oven to 350°F (175°C) and line a large baking sheet with parchment paper.
- Arrange the frozen dough balls 3 inches apart on the sheet and bake for 10 to 12 minutes until the edges are set and the marshmallow centers are puffed and lightly toasted.
Notes
- I highly recommend using Diamond Crystal kosher salt; if you are using fine table salt, reduce the measurement by half (use 1/4 teaspoon instead of 1/2 teaspoon).
- Dutch-process cocoa powder is alkalized, which neutralizes its natural acidity and allows the baking soda to react predictably while delivering a deep, dark chocolate flavor.
- Keep a close eye on the oven during the last two minutes of baking; marshmallows transition from perfectly toasted to burnt and bitter incredibly fast.
- After a day in an airtight container, the marshmallows will lose their initial stretch and become more like a soft, pillowy cream, which is still delicious but different from the day-one gooey pull.
Serving Suggestions
These cookies are best enjoyed warm when the marshmallow is at its peak gooeyness. Here are a few ways to elevate the experience:
- Pair with a tall, ice-cold glass of whole milk.
- Serve warm with a generous scoop of vanilla bean ice cream.
- Drizzle with hot fudge or warm chocolate syrup.
- Enjoy alongside a hot cup of black coffee or a fresh espresso.
Storage and Reheating
Store any leftover cookies in an airtight container at room temperature for up to three days, though they are honestly best enjoyed within the first twenty-four hours.
To revive that legendary, gooey marshmallow stretch, pop a cookie in the microwave for exactly eight seconds.
Do not go a second longer.
If you want to freeze them for later, freeze the unbaked dough balls instead of the baked cookies, as baked marshmallows do not thaw with a pleasant texture.
They will keep beautifully in a freezer bag for up to three months.
Ingredient Substitutes
If you need to swap out any ingredients, here are the best tested alternatives:
- Dutch-process cocoa powder: You can substitute natural cocoa powder, but the cookies will be slightly more acidic and lighter in color.
- Large marshmallows: You can use a handful of mini marshmallows pressed together, but they melt much faster and are harder to seal.
- Semi-sweet chocolate chips: Milk chocolate chips or chopped dark chocolate chunks work beautifully.
These cookies are the ultimate cozy treat, perfect for satisfying your deepest chocolate cravings. Bake a batch, watch the marshmallows puff up in the oven, and enjoy every single gooey, chocolatey bite!
Susan Rosie
I've spent over 12 years perfecting recipes so you can cook with confidence. Every dish on Storied Skillet is tested multiple times – because your dinner matters. I believe in simple ingredients, clear instructions, and big flavors.
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