Introduction

These Chocolate Marshmallow Swirl Cookies combine rich cocoa, gooey marshmallows, and melty chocolate chips for a decadent treat. Perfectly soft with a hint of chewiness, they’re great for sharing or indulging any time.

A white bowl filled with thick, rich chocolate batter being mixed together with swirls of light, creamy white batter throughout, creating a marbled effect. A wooden spatula is partly dipped into the mixture, showing the dense texture of both batters, with smears on the bowl's sides. The bowl sits on a white marbled surface. photo taken with an iphone --ar 4:5 --v 7

Ingredients

1 ¾ cups (220 g) all-purpose flour
1/2 cup (40 g) unsweetened cocoa powder
1 teaspoon baking soda
1/4 teaspoon salt
1/2 cup (115 g) unsalted butter, softened
3/4 cup (150 g) granulated sugar
1/2 cup (100 g) packed light brown sugar
1 large egg
1 teaspoon vanilla extract
1/2 cup (90 g) semi-sweet chocolate chips
1 cup (50 g) mini marshmallows
1/3 cup (60 g) marshmallow fluff (optional)

Instructions

Step 1: Preheat your oven to 350°F (175°C). Line two baking sheets with parchment paper or silicone baking mats. Measure all ingredients for easy assembly.
Step 2: In a medium bowl, whisk together the flour, cocoa powder, baking soda, and salt until evenly combined with no lumps.
Step 3: In a large bowl, cream the softened butter, granulated sugar, and brown sugar using a hand or stand mixer until light and fluffy, about 2–3 minutes.
Step 4: Beat in the egg and vanilla extract until fully incorporated. Scrape the bowl sides to mix evenly.
Step 5: Gradually add the dry ingredients to the wet, mixing on low speed until just combined. Avoid overmixing to keep cookies tender.
Step 6: Gently fold in the semi-sweet chocolate chips to distribute them evenly throughout the dough.
Step 7: Carefully fold in the mini marshmallows and marshmallow fluff (if using). Aim to keep streaks visible for the swirl effect without overmixing.
Step 8: Use a cookie scoop or tablespoon to place dough onto the prepared sheets, spacing about 2 inches apart. Bake for 8–10 minutes until edges are set but centers remain slightly soft.
Step 9: Let cookies cool on the baking sheets for 5 minutes before transferring to a wire rack to finish cooling and firm up slightly.

Tips & Variations

For deeper chocolate flavor, try using Dutch-processed cocoa powder instead of natural cocoa.
Substitute mini marshmallows with chopped regular marshmallows if mini are unavailable.
Add a pinch of espresso powder to enhance the chocolate notes without making the cookies taste like coffee.
Try stirring in chopped toasted nuts for added texture and flavor contrast.
If you prefer a stronger marshmallow swirl, increase the marshmallow fluff slightly but fold carefully to avoid deflating the batter.

Storage

Store cooled cookies in an airtight container at room temperature for up to 4 days. To keep marshmallows soft, add a slice of bread to the container. For longer storage, freeze the cookies for up to 3 months, thawing at room temperature before serving. Reheat briefly in a microwave for a warm, gooey treat.

How to Serve

The image shows several round chocolate cookies on a white plate, each cookie with a marbled swirl pattern made of dark brown chocolate and white cream. The cookies have a cracked surface texture, revealing a soft inside. One cookie is broken in half, placed near the center, showing a soft and crumbly interior. The background is a white marbled surface with a blurred white bowl and some chocolate pieces partially visible. Photo taken with an iphone --ar 4:5 --v 7

Serve this delicious recipe with your favorite sides.

FAQs

Can I use regular marshmallows instead of mini?

Yes, you can chop regular marshmallows into small pieces to mimic the mini ones. Just be mindful that larger pieces may melt differently and affect the swirl texture.

Why are my cookies turning out dry or crumbly?

Overmixing the dough or baking too long can cause dryness. Mix just until combined and take cookies out when edges are set but centers are still soft to keep them tender and chewy.