The marshmallow halves look almost too large when they go onto the cookies, but that’s exactly what gives each one a soft, pillowy top instead of a marshmallow that disappears into the dough. I add them after the cookies have already started baking, so the edges can set before the topping gets its turn in the oven. These hot chocolate cookies come out with a cocoa-rich center, semisweet chocolate chips, and a puffed marshmallow on top.
The dough gets its chocolate flavor from both unsweetened cocoa powder and hot cocoa mix. That pairing gives the cookies more of a hot-chocolate character than cocoa powder alone, while the butter-and-sugar base keeps them tender. A short chill makes the dough easier to portion, and baking the sheets one at a time keeps the cookies on the center rack where you can watch the marshmallows puff.
Kitchen Note
Set each marshmallow on the cookie with its cut side down. It sits more securely while it puffs, and the rounded side stays visible on top.
Save these hot chocolate cookies for a batch with soft cocoa centers, chocolate chips, and a puffed marshmallow on every cookie.
Why the Half-Hour Chill Helps Cocoa Cookie Dough
Cocoa dough can feel softer and stickier than a plain vanilla cookie dough, especially after the chocolate chips are folded in. Chilling it gives the butter time to firm back up, which makes the scoops easier to handle and helps them keep a more even shape as they bake. That matters here because every cookie needs a marshmallow placed on top partway through baking; a tidy, stable cookie is easier to top without nudging it out of place.
Cover the bowl while the dough chills so the surface doesn’t dry out. After the rest, portion the dough into equal scoops and leave open space between them on the parchment-lined sheets. If the dough still feels sticky, work with a spoon or cookie scoop rather than adding flour. Extra flour changes the balance and can leave the centers dry instead of soft.
The chill also gives you a useful pause to heat the oven and prepare the baking sheets. Keep the dough covered until you’re ready to scoop, and don’t skip the chill just because the dough seems firm at first; softened butter can warm quickly as you mix and handle it.
What the Cocoa Powder and Hot Cocoa Mix Each Bring
- Unsweetened cocoa powder — This supplies the concentrated chocolate base without adding sugar. Use a fresh, fragrant cocoa if yours has been open for a long time; a stale tin can taste flat. Keep it unsweetened rather than swapping in extra hot cocoa mix, which is usually sweetened and won’t behave like plain cocoa.
- Hot cocoa mix — This adds the familiar sweetened hot-chocolate note alongside the cocoa powder. Different brands vary in sweetness and cocoa intensity, so use a mix you enjoy drinking. A flavored hot cocoa mix is also an easy way to shift the cookie’s character without changing the rest of the dough.
- All-purpose flour — It gives the cookies structure while keeping them tender. For a gluten-free version, use a cup-for-cup gluten-free baking blend in place of the all-purpose flour; the cookies may have a slightly different, less chewy texture. Measure the flour without packing it into the cup.
- Butter and sugars — Softened unsalted butter creams with the granulated and light brown sugars to build the dough’s base. The brown sugar contributes moisture and a deeper sweetness, so replacing it with all granulated sugar will make the cookies less soft. The butter should yield when pressed but shouldn’t look melted or greasy.
- Eggs and vanilla — The eggs bind the dough and help it bake into a soft cookie, while vanilla rounds out the chocolate. Add the eggs one at a time so they incorporate evenly. There isn’t a reliable direct swap here that keeps the same texture.
- Semisweet chocolate chips — These create little pockets of chocolate through the cocoa dough. Bittersweet chips work if you want a less-sweet contrast; milk chocolate chips make the overall cookie sweeter. Fold them in after the flour mixture so they stay intact.
- Large marshmallows — Halving large marshmallows gives each cookie a substantial topping that puffs in the final minutes of baking. Mini marshmallows don’t make the same neat, single top and are more likely to spread unevenly, so stick with large ones for this look.
Mixing and Baking the Cookies Without Drying Them Out
Cream the Butter and Sugars Until Fluffy
Beat the softened butter with both sugars on medium speed for 2 to 3 minutes, until the mixture looks lighter and fluffy. Scrape the bowl if butter or sugar is clinging to the sides, so the mixture creams evenly. Beat in the eggs one at a time, then add the vanilla and mix until combined. If the mixture looks a little uneven after an egg goes in, keep beating until it comes together before adding the next one.
Bring the Cocoa Dough Together Gently
Whisk the flour, cocoa powder, hot cocoa mix, baking soda, and kosher salt in a separate bowl before adding them to the butter mixture. Mix on low just until no dry streaks remain; continuing to beat after the flour disappears can make the cookies tougher. Fold in the semisweet chocolate chips, then cover the dough and chill it for 30 minutes. The finished dough should hold a scoop without feeling runny.
Scoop Even Portions and Start the Bake
Heat the oven to 350°F and line two 18×13-inch baking sheets with parchment paper. Scoop the dough into 24 portions, about 2 tablespoons each, and arrange 12 on each sheet with space between them. Bake one sheet at a time on the center rack for 8 minutes. The cookies won’t be finished at this point; they need the final bake with the marshmallows, so take the sheet out carefully and work while the cookies are still hot.
Add the Marshmallows and Finish Baking
Place one marshmallow half, cut side down, on each cookie, then return the sheet to the oven for 2 to 3 minutes. Watch for puffed marshmallows and cookie edges that look set; the centers can still look soft. If the marshmallows haven’t puffed yet, give them the full extra minute rather than pulling the sheet early. Cool the cookies on their baking sheets for 5 minutes before transferring them to a wire rack, since they’re delicate while hot.
Easy Ways to Change the Chocolate or Make a Gluten-Free Batch
Use a Darker Chocolate Chip
Swap the semisweet chips for bittersweet chocolate chips. The darker chocolate gives you a more pronounced contrast with the sweet cocoa mix and marshmallow, without changing how you mix or portion the dough.
Try a Flavored Hot Cocoa Mix
Use a flavored hot cocoa mix in place of a plain one for a gentle flavor change throughout the cookie. Because mixes differ in sweetness and intensity, the result will depend on the brand; the unsweetened cocoa powder still provides the deeper chocolate base.
Make Them Gluten-Free
Replace the all-purpose flour with a cup-for-cup gluten-free baking blend made for baking. The cookies will still have the cocoa and marshmallow combination, though the crumb may be a little less chewy than the original.
Storage and Reheating
- Refrigerator: Keep the cookies in an airtight container for up to 5 days. The cold firms the cookie and makes the marshmallow chewier, so let them come to room temperature for a softer bite.
- Freezer: Freeze completely cooled cookies in an airtight container, with parchment between layers, for up to 2 months. Thaw at room temperature; the marshmallow may feel a little tackier afterward.
- Reheating: Warm one cookie briefly in the microwave, just until soft. Longer heating can make the marshmallow molten, so use short bursts and check between them.
Questions That Come Up When Baking Hot Chocolate Cookies
Hot Chocolate Cookies
Ingredients
Equipment
Method
- Whisk the flour, cocoa powder, hot cocoa mix, baking soda, and salt in a medium bowl.
- Beat the butter, granulated sugar, and brown sugar in a large bowl with a mixer on medium speed for 2 to 3 minutes, until fluffy.
- Beat in the eggs one at a time.
- Beat in the vanilla until combined.
- Add the flour mixture and mix on low just until no dry streaks remain.
- Fold in the chocolate chips.
- Cover and chill the dough for 30 minutes.
- Heat the oven to 350°F.
- Line two 18x13-inch baking sheets with parchment paper.
- Scoop the dough into 24 portions, about 2 tablespoons each, and arrange 12 on each baking sheet, leaving space between them.
- Bake one sheet at a time on the center rack for 8 minutes.
- Remove the sheet from the oven and place a marshmallow half, cut side down, on each cookie.
- Return the sheet to the oven for 2 to 3 minutes, until the marshmallows puff and the cookie edges are set, then repeat with the second sheet.
- Cool the cookies on the baking sheets for 5 minutes.
- Transfer the cookies to a wire rack to cool.
