The Ultimate Chocolate Marshmallow Swirl Cookies

Introduction

These Chocolate Marshmallow Swirl Cookies are the perfect marriage of rich, fudgy brownie-like dough and delightfully gooey, caramelized marshmallow topping. They capture the nostalgic warmth of a campfire S’more but in a convenient, beautifully textured drop cookie. Originating from a desire to elevate the classic chocolate cookie, this recipe ensures a perfectly chewy center and molten marshmallow swirl, making them an instant favorite for potlucks, holidays, or a simple weekend baking project.

Ingredients

• 115g (1/2 cup or 1 stick) unsalted butter, softened
• 100g (1/2 cup) granulated sugar
• 110g (1/2 cup, packed) light brown sugar
• 1 large egg, room temperature
• 1 teaspoon vanilla extract
• 190g (1 1/2 cups) all-purpose flour
• 50g (1/2 cup) unsweetened cocoa powder (Dutch process preferred)
• 1 teaspoon baking soda
• 1/2 teaspoon baking powder
• 1/2 teaspoon fine sea salt
• 150g (3 cups) mini marshmallows

Step-by-step Preparation

1. Preheat your oven to 350°F (175°C). Line two large baking sheets with parchment paper or silicone baking mats.
2. In a large bowl or stand mixer, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy (about 3–4 minutes). Tip: Ensure the butter is truly soft, not melted, for the best texture.
3. Beat in the egg and vanilla extract until just combined. Scrape down the sides of the bowl.
4. In a separate medium bowl, whisk together the flour, cocoa powder, baking soda, baking powder, and salt.
5. Gradually add the dry ingredients to the wet ingredients, mixing on low speed until the dough just comes together. Be careful not to overmix, as this develops gluten and can make the cookies tough.
6. Using a standard ice cream scoop (about 3 tablespoons), scoop the dough onto the prepared baking sheets, leaving about 2 inches between each cookie.
7. Bake for 8 minutes. The cookies will look slightly puffy and set around the edges but still soft in the center.
8. Remove the sheets from the oven. Quickly press 5–7 mini marshmallows onto the top center of each partially baked cookie.
9. Return the baking sheets to the oven and bake for an additional 2–4 minutes, or until the marshmallows are puffed up, golden brown, and delightfully gooey. Tip: Watch closely during this final step; marshmallows can burn quickly!
10. Let the cookies cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.

Nutritional Information

Please note that these nutritional facts are estimates and vary based on the exact size and brand of ingredients used. Per serving (one medium cookie), expect approximately 280–320 calories, containing high levels of sugar and saturated fat. While these cookies are a decadent treat, they provide little in terms of essential vitamins or fiber, and should be enjoyed in moderation as part of a balanced diet.

Storage

These cookies are best enjoyed the day they are baked while the marshmallow is still soft and pliable. If you have leftovers, store them in an airtight container at room temperature for up to 3 days. The marshmallows will firm up as they cool; to restore the gooey texture, microwave the cookie for 5–10 seconds before serving. You can freeze the baked cookies for up to 3 months; thaw them overnight at room temperature.

Conclusion

The contrast between the deep, dark chocolate base and the sugary, toasted marshmallow makes these cookies irresistible. For an extra touch of sophistication, sprinkle a pinch of flaky sea salt (like Maldon) over the marshmallow immediately after they come out of the oven. For variations, try adding a teaspoon of espresso powder to the cocoa mixture to deepen the chocolate flavor, or fold in a handful of chocolate chips before baking for triple chocolate goodness. Serve warm with a cold glass of milk for the ultimate comfort treat.