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If you adore the refreshing crunch of Thin Mints combined with the gooey charm of marshmallows and the rich, fudgy goodness of brownies, then you are in for an unforgettable treat with this Thin Mint Marshmallow Brownies Recipe. It’s a luscious dessert that perfectly balances minty freshness, chocolate depth, and that irresistible marshmallow cream, creating a dessert experience that feels like a warm hug and a fun celebration all at once.

Ingredients You’ll Need
These ingredients come together in a simple but spectacular way, each playing an essential part in building the perfect texture, flavor, and visual delight of the brownies. From butter that enriches every bite to Thin Mints that add the signature minty crunch, every element has a role that makes this recipe truly shine.
- 3/4 cup salted butter: Provides a rich and creamy base, especially when browned for a nutty depth.
- 1 & 1/4 cups granulated sugar: Adds sweetness and contributes to the fudgy texture.
- 3/4 cup unsweetened cocoa powder: Delivers deep chocolate flavor and a dark, inviting color.
- 1/4 teaspoon salt: Enhances and balances the sweetness for a well-rounded taste.
- 1/2 tablespoon water: Helps to smooth out the batter, making it easier to mix.
- 1 teaspoon vanilla extract: Adds warmth and depth to the chocolate profile.
- 2 eggs: Provide structure and moisture, creating that perfect brownie chew.
- 1/2 cup all-purpose flour: Binds the ingredients without weighing down the batter.
- 1/2 cup semi-sweet or dark chocolate chips: Offers melty pockets of extra chocolate within the brownies.
- 1 7-oz. jar marshmallow crème: Creates a luscious, fluffy topping that contrasts beautifully with the dense brownie.
- 1/8 teaspoon or less peppermint extract: Brings out the refreshing mint flavor in a subtle way.
- 10 drops green food coloring: Gives the marshmallow topping that iconic minty green color to excite the senses.
- 15 Thin Mints or mint Oreos (roughly chopped): Add crunch and iconic mint-chocolate flavor as a finishing touch.
How to Make Thin Mint Marshmallow Brownies Recipe
Step 1: Preheat and Prepare Your Pan
Start by preheating your oven to 350 degrees F. Line an 8×8 or 9×9 inch baking dish with aluminum foil and spray it with nonstick spray, or simply spray the pan. This will ensure your brownies release easily once baked, making cleanup a breeze.
Step 2: Brown the Butter
Melt the butter over medium heat in a large saucepan, stirring occasionally. You’ll notice it foam up and then calm down as golden, nutty milk solids form—the smell is heavenly. This step is totally optional, but browning the butter adds an incredible warmth and richness that elevates the whole batch of brownies.
Step 3: Mix the Dry Ingredients
While the butter is browning, combine the sugar, cocoa powder, and salt in a mixing bowl or the bowl of a stand mixer. These dry ingredients form the chocolate foundation of the brownies, so make sure they’re well blended before moving on.
Step 4: Combine Butter with Dry Ingredients
Once the butter reaches that perfect browned stage, pour it immediately into the dry mix to stop the cooking process and beat until smooth. It’s the moment when the batter starts to look glossy and perfect!
Step 5: Add Liquid Flavorings and Eggs
Add the water and vanilla extract next, stirring to combine. Then, whisk in the eggs quickly to avoid any curdling since the batter is still warm. This quick mixing keeps the batter silky smooth and ready for the next step.
Step 6: Incorporate Flour and Chocolate Chips
Gently fold in the flour and chocolate chips until just incorporated. The batter will thicken to a dense, cement-like texture, but its flavor will be nothing short of extraordinary—feel free to sneak a little taste here!
Step 7: Bake the Brownies
Spread the batter evenly into your prepared pan with a sturdy rubber spatula. Bake for 25 to 30 minutes, checking for doneness by inserting a toothpick; it should come out clean or with just a few moist crumbs to ensure fudgy perfection.
Step 8: Cool and Prepare Marshmallow Topping
Let the brownies cool completely, or speed things along by popping them in the freezer for 10 minutes—either way works wonderfully. Meanwhile, warm the marshmallow crème in the microwave for 15 to 20 seconds until it peeks above the jar’s rim, making it easier to work with.
Step 9: Flavor and Color Your Marshmallow
Transfer the warm marshmallow crème to a bowl, add the peppermint extract, and drop in the green food coloring. Mix thoroughly, scraping the sides, until you achieve that vivid minty shade and a perfectly flavored fluffy topping.
Step 10: Assemble the Final Layers
Pour the green-hued marshmallow mixture over the cooled brownies and spread it gracefully all the way to the edges. Then, sprinkle the chopped Thin Mints evenly across the top, pressing lightly so they nestle perfectly into the marshmallow cloud.
How to Serve Thin Mint Marshmallow Brownies Recipe

Garnishes
For an extra festive flair, consider adding a drizzle of melted dark chocolate over the marshmallow topping or a light dusting of powdered sugar to amplify both the elegance and flavor layers. Fresh mint sprigs on the side can also enhance the minty vibe visually and aromatically.
Side Dishes
Pair these brownies with a scoop of vanilla bean ice cream to add a creamy contrast or serve alongside a hot cup of mint-infused tea or coffee to mirror and elevate the dessert’s refreshing notes. Light fruit salads with berries also complement the richness beautifully.
Creative Ways to Present
Slice these brownies into small squares and serve on a decorative platter with alternating colors of mini marshmallows or mint leaves. For a crowd-pleaser, assemble them in parfait glasses layered with whipped cream or crushed Thin Mints for a stunning dessert display everyone will talk about.
Make Ahead and Storage
Storing Leftovers
Store any leftover Thin Mint Marshmallow Brownies Recipe in an airtight container at room temperature for up to three days or in the refrigerator for about a week. Keep them covered to preserve the chewy texture and prevent the marshmallow topping from drying out.
Freezing
If you want to save them longer, wrap brownies tightly in plastic wrap, then foil, and freeze for up to three months. To enjoy, thaw overnight in the fridge and bring back to room temperature before serving.
Reheating
To warm up chilled brownies, microwave a single piece for 10 to 15 seconds to soften the marshmallow and let the chocolate melt slightly. Avoid overheating to keep the marshmallow from becoming too sticky or the chocolate from seizing up.
FAQs
Can I use regular marshmallows instead of marshmallow crème?
Marshmallow crème provides a smooth, spreadable texture that works perfectly for this recipe, but you can melt regular marshmallows with a little cream or butter to create a similar topping. The texture might be a bit different but still delicious!
Is peppermint extract necessary for the marshmallow layer?
While the brownies will still be tasty without peppermint extract, it adds that signature mint flavor reminiscent of Thin Mints and ties the whole dessert together beautifully. A little goes a long way to keep it from overpowering.
Can I substitute Thin Mints with mint Oreos?
Absolutely! Mint Oreos work just as well for the chopped topping, offering a similar mint-chocolate crunch that complements the marshmallow and brownie layers perfectly.
How do I know when the brownies are done baking?
Check by inserting a toothpick into the center of the brownies. It should come out clean or with a few moist crumbs but not wet batter. This ensures fudgy, tender brownies that aren’t overbaked.
Can I make this recipe gluten-free?
Yes! Use a 1:1 gluten-free baking flour in place of all-purpose flour. The texture and flavor should remain delightfully close to the original, with the indulgent mint and marshmallow notes shining through.
Final Thoughts
Making this Thin Mint Marshmallow Brownies Recipe is like inviting a burst of joy and nostalgia to your kitchen. It’s a crowd-pleaser that’s as fun to make as it is to eat, with layers of flavor and texture that will have everyone coming back for seconds. Trust me, once you try these brownies, they’ll become a staple in your dessert rotation, guaranteed to bring smiles every time.
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Print
Thin Mint Marshmallow Brownies Recipe
- Prep Time: 10 minutes
- Cook Time: 25 minutes
- Total Time: 35 minutes
- Yield: 12 servings
- Category: Dessert
- Method: Baking
- Cuisine: American
Description
These Thin Mint Marshmallow Brownies are a decadent twist on classic brownies, featuring rich brown butter-infused chocolate batter topped with a peppermint-flavored marshmallow creme and finished with crunchy chopped Thin Mint cookies for a refreshing mint-chocolate combination.
Ingredients
Brownie Batter
- 3/4 cup salted butter
- 1 & 1/4 cups granulated sugar
- 3/4 cup unsweetened cocoa powder
- 1/4 teaspoon salt
- 1/2 tablespoon water
- 1 teaspoon vanilla extract
- 2 eggs
- 1/2 cup all-purpose flour
- 1/2 cup semi-sweet or dark chocolate chips
Marshmallow Topping
- 1 7-oz. jar marshmallow crème
- 1/8 teaspoon or less peppermint extract
- 10 drops green food coloring
- 15 Thin Mints or mint Oreos, roughly chopped
Instructions
- Preheat Oven: Preheat your oven to 350 degrees F to prepare for baking the brownies.
- Prepare Baking Dish: Line an 8×8 or 9×9 inch baking dish with aluminum foil and spray with nonstick spray, or simply spray the pan directly to prevent sticking.
- Bake Brown Butter: Melt the butter in a large saucepan over medium heat, stirring occasionally. Allow the butter to foam, then brown with milk solids forming. When it smells nutty and slightly caramelized, it’s done. This adds richness but can be skipped if desired.
- Mix Dry Ingredients: While butter browns, combine sugar, cocoa powder, and salt in a bowl or stand mixer.
- Combine Butter with Dry Mix: Pour the hot browned butter immediately into the sugar-cocoa mixture to halt cooking, then beat until smooth.
- Add Liquids and Eggs: Mix in water and vanilla extract. Quickly add the eggs one at a time to avoid curdling, especially if the butter is still warm.
- Add Flour and Chocolate Chips: Stir in the flour and chocolate chips until just combined, resulting in a thick batter similar to cement. Taste for balance.
- Spread and Bake Batter: Using a rubber spatula, spread batter evenly in the prepared pan. Bake for 25-30 minutes until a toothpick inserted in the center comes out clean.
- Cool Brownies: Remove brownies from oven and allow to cool completely, or chill in freezer for about 10 minutes to speed cooling.
- Prepare Marshmallow Topping: Remove foil from marshmallow crème jar top; microwave for 15-20 seconds until it just rises past the jar lip.
- Flavor Marshmallow Creme: Transfer marshmallow crème to a bowl or mixer; add peppermint extract and green food coloring. Mix until evenly colored and smooth, scraping sides as needed.
- Top Brownies: Spread the peppermint-flavored marshmallow creme evenly over cooled brownies, reaching edges.
- Add Crunchy Topping: Sprinkle chopped Thin Mint cookies over the marshmallow layer, pressing gently to adhere if necessary.
- Set and Serve: Let marshmallow topping come back to room temperature and stabilize before cutting brownies into 12 servings and serving.
Notes
- Brown butter adds a nutty richness but can be skipped by simply melting the butter without browning.
- Use fresh peppermint extract carefully, as it can become overpowering; start with less and adjust if desired.
- Freezing the brownies briefly after baking helps speed the cooling process for easier topping application.
- Chopped Thin Mints add a refreshing crunch and mint flavor; mint Oreos can be an alternative.
- Ensure the brownie batter is thick and spreadable; overmixing after adding flour can toughen the texture.

