Mint Chocolate Brownie Bars Recipe

BySarah
Jump to Recipe· 4.7 from 11 reviews

If you’re a fan of that classic combo of refreshing mint and rich chocolate, you’re going to absolutely love this Mint Chocolate Brownie Bars Recipe. Trust me, these bars have become my go-to dessert whenever I want something that feels both indulgent and cool at the same time. Think fudgy brownies layered with a creamy mint frosting, topped with a smooth chocolate ganache—seriously, it’s like bliss in every bite. Stick with me, and I’ll walk you through exactly how to nail these at home.

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Why This Recipe Works

  • Layered Flavor Harmony: The combo of fudgy brownies, cool mint frosting, and rich chocolate topping creates that perfect balance you’ll crave.
  • Simple Techniques: No fancy ingredients or complicated steps—just straightforward mixing and layering for a killer dessert.
  • Customizable Mint Intensity: You can easily dial the peppermint flavor up or down to suit your taste buds.
  • Make-Ahead Friendly: This recipe’s cooling and chilling stages mean you can prepare in advance with ease.
Mint Chocolate Brownie Bars, Mint Chocolate Dessert, Fudgy Brownie Bars, Mint Chocolate Layered Dessert, Easy Mint Brownies - The image shows square dessert bars with three clear layers. The bottom layer is thick and dark brown, crumbly with a rough texture. The middle layer is a thick, creamy mint green that looks soft and smooth. The top layer is a shiny, smooth dark chocolate coating that is evenly spread. The bars are placed on white parchment paper on a dark wooden surface with a white marbled texture background. Photo taken with an iphone --ar 2:3 --v 7 this …

Ingredients & Why They Work

Each ingredient in this Mint Chocolate Brownie Bars Recipe is thoughtfully chosen to build those layers of flavor and perfect texture. From the buttery chocolate base to the sweetly refreshing mint layer, everything comes together effortlessly. When shopping, I always like to grab high-quality chocolate and real peppermint extract for that authentic taste.

Mint Chocolate Brownie Bars, Mint Chocolate Dessert, Fudgy Brownie Bars, Mint Chocolate Layered Dessert, Easy Mint Brownies - Flat lay of a small pile of coarsely chopped semi-sweet chocolate chunks, a few large whole brown eggs with clean shells, a small mound of light and dark brown granulated sugar side by side, a small white ceramic bowl filled with softened unsalted butter, a small white ceramic bowl with natural unsweetened cocoa powder, a small white ceramic bowl of fine all-purpose flour, a small white ceramic bowl containing fine confectioners’ sugar, a small white ceramic bowl with milk, a couple of fresh green mint sprigs, and a small white ceramic bowl with glossy semi-sweet chocolate chips, all arranged with perfect symmetry and balanced proportions, placed on a clean white marble surface, soft natural light, photo taken with an iPhone, professional food photography style, fresh ingredients, white ceramic bowls, no bottles, no duplicates, no utensils, no packaging --ar 2:3 --v 7 --p m7354615311229779997
  • Unsalted Butter: Melts into the batter for rich, moist brownies and smooth frosting without the salt overpowering the layers.
  • Semi-Sweet Chocolate: Provides deep chocolate flavor and balances sweetness—go for good-quality chocolate pieces or chips.
  • Granulated & Light Brown Sugar: Granulated adds sweetness; brown sugar brings moisture and a subtle caramel note to the brownies.
  • Large Eggs: Help bind the brownies and contribute to that perfect fudgy texture when used at room temperature.
  • Vanilla Extract: Rounds out the chocolate flavor with warm notes.
  • Salt: Enhances all the flavors and cuts through the sweetness just right.
  • All-Purpose Flour: Keeps the brownies tender but firm enough to hold the layers.
  • Natural Unsweetened Cocoa Powder: Adds intensity and richness without extra sweetness.
  • Confectioners’ Sugar: Essential in the mint frosting for that silky, sweet smoothness.
  • Milk: Softens the frosting to the perfect spreading consistency.
  • Peppermint Extract: Absolutely key for that true mint flavor—none of that toothpaste taste from cheaper mint extracts.
  • Optional Green Food Coloring: Because sometimes you want your brownies to look as fresh as they taste!
  • Chocolate Chips: Melted with butter for the top layer, adding a glossy, decadent finish.
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Note: You’ll find the complete list of ingredients, along with their exact measurements, in the printable recipe card at the bottom of this post.

Tweak to Your Taste

I love making this Mint Chocolate Brownie Bars Recipe my own by occasionally switching up how intense the mint flavor is and experimenting with toppings. You should definitely feel free to customize it to what makes your mouth happiest!

  • Variation: Sometimes I add a few crushed peppermint candies on top of the chocolate layer for crunch and extra minty zing—it’s like winter in a bite!
  • Dietary Modification: I’ve tried using coconut oil in place of butter for a dairy-free option, and while it changes the texture a bit, it still tastes great.
  • Seasonal Twist: Swap peppermint extract for orange or raspberry extract for a fun seasonal spin that’s just as delicious.

Step-by-Step: How I Make Mint Chocolate Brownie Bars Recipe

Step 1: Melt Your Chocolate & Butter Base

First things first, melt together the butter and chopped semi-sweet chocolate in a saucepan over medium heat, stirring constantly so it doesn’t scorch. This usually takes about 5 minutes, and you’ll want to watch so the mixture stays smooth and glossy. Alternatively, you can microwave it in short bursts—20 seconds at a time—stirring in between until fully melted. Then, pour it into a large bowl and let it cool for 10 minutes. This cooling step is a game-changer because adding eggs to hot chocolate will scramble them, and nobody wants grandma’s scrambled brownie eggs.

Step 2: Mix in Sugars & Eggs, Then Fold Dry Ingredients

Once your chocolate mixture is cool, whisk in both the granulated and light brown sugars until smooth. Then, add your eggs one at a time—making sure each is fully mixed before adding the next—plus the vanilla extract for warmth. Finally, gently fold in salt, flour, and cocoa powder with a spatula. The batter will be thick but luscious, just perfect for fudgy brownies that hold these layers beautifully.

Step 3: Bake & Cool Your Brownie Base

Pour the brownie batter into a parchment-lined 9×13-inch pan, which helps for easy removal later. Bake at 350°F (177°C) for about 35-36 minutes. The secret here is to keep an eye on your oven after 30 minutes and do the toothpick test. When it comes out with just a few moist crumbs—not wet batter—your brownies are done. Once baked, let it cool completely right in the pan on a wire rack. Cooling thoroughly here is crucial before moving on to the frosting layer so it won’t melt or slide later.

Step 4: Whip Up the Mint Frosting Layer

Using a mixer, beat softened butter until creamy, then gradually add confectioners’ sugar and milk, mixing until smooth and fluffy. Stir in peppermint extract—start with 1 and 1/4 teaspoons and adjust to your liking—plus green food coloring if you want that classic mint shade. Spread this frosty layer evenly over the cooled brownies. Pop the whole thing in the fridge for at least an hour; chilling helps the frosting firm up so spreading the chocolate layer next becomes easy-peasy without mixing the layers.

Step 5: Finish with a Glossy Chocolate Top

Melt butter and chocolate chips gently together on the stove or in the microwave, stirring until silky smooth. Pour this glossy chocolate over the chilled mint layer, then spread it carefully with an offset spatula. Place back in the fridge to chill for at least an hour until set. Pro tip: I usually let it chill overnight since the layers get nice and firm, making cutting neat squares a breeze.

Step 6: Slice & Serve Like a Pro

Use a sharp, large knife and make quick, confident cuts—wiping the blade clean between slices helps keep those edges crisp and pretty. These bars actually hold up well at room temp for a few hours, but I store leftovers in the fridge to keep each layer firm and fresh-tasting.

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Pro Tips for Making Mint Chocolate Brownie Bars Recipe

  • Room Temp Eggs: I always bring my eggs to room temperature before adding—this helps them incorporate better and keeps your batter silky smooth.
  • Chill Between Layers: Refrigerate each layer before adding the next; it keeps layers distinct and prevents mixing or sliding.
  • Peppermint Extract Quality: Invest in good peppermint extract—it truly makes a difference versus generic mint flavorings.
  • Cutting Technique: Use a very sharp, large knife, and don’t rush your cuts—wiping the knife between slices ensures clean edges every time.

How to Serve Mint Chocolate Brownie Bars Recipe

Mint Chocolate Brownie Bars, Mint Chocolate Dessert, Fudgy Brownie Bars, Mint Chocolate Layered Dessert, Easy Mint Brownies - The image shows a close-up of stacked chocolate mint bars with three clear layers. The bottom layer is a thick, dark brown, dense chocolate base with a slightly rough texture. The middle layer is a mint-green creamy filling, smooth but fluffy-looking with tiny air bubbles. The top layer is a glossy, dark chocolate sheet, smooth and shiny with a very clean finish. The bars are cut into square shapes resting on white parchment paper on a white marbled surface. Photo taken with an iphone --ar 2:3 --v 7

Garnishes

Personally, I adore sprinkling a few crushed peppermint candies or mini chocolate chips on top before the final chill; it adds a little crunch and festive look perfect for holiday gatherings. If I’m feeling fancy, a tiny dollop of whipped cream alongside elevates every bite.

Side Dishes

These mint chocolate bars pair beautifully with a scoop of vanilla ice cream or a strong cup of coffee for contrast. For parties, I like serving them alongside fresh berries or a simple fruit salad to balance the sweetness.

Creative Ways to Present

When I want to wow guests, I arrange the bars on a slate board with sprigs of fresh mint and edible flowers for a pretty, rustic vibe. Layering them in decorative boxes or wrapping in parchment tied with twine also makes a lovely gift idea that everyone raves about.

Make Ahead and Storage

Storing Leftovers

I keep leftovers tightly covered in the refrigerator—it keeps the mint frosting and chocolate topping firm without drying out the brownies. They stay delicious for up to 5 days, and honestly, they often vanish before then!

Freezing

Freezing works well too! I usually freeze the baked brownie base alone, then thaw it fully before adding mint frosting and chocolate topping for the freshest finish. But if you’re short on time, freezing fully assembled bars works—just thaw overnight in the fridge before cutting.

Reheating

Reheat at room temperature—these bars are best served slightly cool to keep textures intact. If you like, let them sit out 15-20 minutes before serving, but I don’t recommend microwaving since it can melt the frosting and make a mess.

FAQs

  1. Can I use spearmint extract instead of peppermint for this Mint Chocolate Brownie Bars Recipe?

    While you technically can substitute spearmint extract, I don’t recommend it for this recipe. Spearmint tends to have a more herbal, toothpaste-like flavor, whereas peppermint gives a much truer mint taste that pairs perfectly with chocolate. For the best mint experience, stick with high-quality peppermint extract.

  2. How do I know when the brownies are perfectly baked?

    Look for the edges to start pulling away from the pan and do the toothpick test: insert it in the center, and when it comes out with just a few moist crumbs (not wet batter), they’re ready. Every oven’s a bit different, so start checking at 30 minutes to avoid overbaking.

  3. Can I make these Mint Chocolate Brownie Bars gluten-free?

    Absolutely! Just swap the all-purpose flour for a 1:1 gluten-free baking flour blend. I suggest you check how your chosen flour absorbs liquids and keep an eye on texture since gluten-free flours can vary. The taste is still fantastic, though!

  4. What’s the best way to cut perfect squares without making a mess?

    Use a very sharp, large knife and make quick, decisive cuts. Wipe the blade clean with a paper towel between each slice to avoid dragging chocolate and frosting around. Chilling your brownies well before slicing also helps keep the layers intact and clean.

Final Thoughts

This Mint Chocolate Brownie Bars Recipe has quickly become one of my favorite treats to bake and share, mainly because it hits all the right notes—rich, refreshing, and just the right kind of indulgent. It’s the recipe I reach for when I want to impress friends or just treat myself to something special. I hope you’ll give it a try and find as much joy in making and eating these as I do. I promise, once you taste that perfect mint and chocolate harmony, you’ll be hooked too!

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Mint Chocolate Brownie Bars Recipe

5 Stars 4 Stars 3 Stars 2 Stars 1 Star 4.7 from 11 reviews
  • Author: Sarah
  • Prep Time: 1 hour
  • Cook Time: 36 minutes
  • Total Time: 6 hours
  • Yield: 24 brownies
  • Category: Dessert
  • Method: Baking
  • Cuisine: American
  • Diet: Vegetarian
Print Recipe

Description

Classic Mint Chocolate Brownies combine rich, fudgy chocolate brownies with a smooth, creamy mint frosting and a glossy chocolate layer on top for a decadent treat perfect for any occasion.

Ingredients

Units Scale

Brownies

  • 1 cup (16 Tbsp; 226g) unsalted butter
  • 8 ounces semi-sweet chocolate, coarsely chopped
  • 1 and 1/2 cups (300g) granulated sugar
  • 1/2 cup (100g) packed light brown sugar
  • 4 large eggs, at room temperature
  • 2 teaspoons pure vanilla extract
  • 1/2 teaspoon salt
  • 1/2 cup + 3 tablespoons (86g) all-purpose flour (spooned & leveled)
  • 1/4 cup (21g) natural unsweetened cocoa powder

Mint Frosting Layer

  • 1/2 cup (8 Tbsp; 113g) unsalted butter, softened to room temperature
  • 2 cups (240g) confectioners’ sugar
  • 2 Tablespoons (30ml) milk
  • 1 and 1/4 teaspoons peppermint extract
  • Optional: 1 drop liquid or gel green food coloring

Chocolate Layer

  • 1/2 cup (8 Tbsp; 113g) unsalted butter
  • 1 heaping cup (around 200g) semi-sweet chocolate chips

Instructions

  1. Melt Chocolate and Butter: In a medium saucepan over medium heat, melt the butter and coarsely chopped semi-sweet chocolate, stirring constantly for about 5 minutes until smooth. Alternatively, melt in the microwave in 20 second increments, stirring after each until fully melted. Remove from heat and pour into a large mixing bowl. Allow to cool slightly for 10 minutes.
  2. Prepare Oven and Pan: Adjust the oven rack to the lower third position and preheat the oven to 350°F (177°C). Line a 9×13-inch baking pan with parchment paper, covering the bottom and sides with an overhang for easy removal. Set aside.
  3. Make Brownie Batter: Whisk the granulated sugar and brown sugar into the cooled chocolate and butter mixture until combined. Add eggs one at a time, whisking well after each addition to create a smooth mixture. Stir in vanilla extract. Gently fold in salt, all-purpose flour, and cocoa powder until just combined. Pour the batter evenly into the prepared pan.
  4. Bake Brownies: Bake the brownies for 36 minutes or until they start to pull away from the edges of the pan and a toothpick inserted in the center comes out with a few moist crumbs. Watch closely after 30 minutes and perform the toothpick test to avoid overbaking. Remove from oven and allow the brownies to cool completely in the pan on a wire rack.
  5. Prepare Mint Frosting: In a medium bowl, beat softened butter on medium speed until creamy, about 2 minutes, using a handheld or stand mixer with a paddle attachment. Add confectioners’ sugar and milk, beating on low for 2 minutes, then increase speed to high and beat for 1 minute. Add peppermint extract and optional green food coloring, beating on high for an additional minute. Taste and adjust peppermint if desired.
  6. Frost the Brownies: Once brownies are completely cooled, lift them out of the pan using the parchment overhang and place on a baking sheet. Spread the mint frosting evenly over the brownies. Refrigerate for at least 1 hour to let the frosting set, making the next step easier.
  7. Prepare Chocolate Topping: Melt the butter and semi-sweet chocolate chips in a medium saucepan over medium heat, stirring constantly for about 5 minutes until smooth. Alternatively, melt in the microwave in 20 second increments, stirring after each until fully melted and smooth.
  8. Apply Chocolate Layer: Pour the melted chocolate mixture over the chilled mint frosting layer. Spread gently and evenly with a knife or offset spatula. Return the baking sheet with the brownies to the refrigerator and chill for at least 1 hour or up to overnight to set the chocolate topping.
  9. Cut and Serve: Remove brownies from the refrigerator before cutting. Use a very sharp large knife and make quick cuts, wiping the knife with a paper towel between cuts for clean squares. Brownies can sit at room temperature for a few hours. Store leftovers tightly covered in the refrigerator for up to 5 days.

Notes

  • Freezing: Freeze baked brownies without frosting, then thaw overnight in the refrigerator before adding mint frosting and chocolate topping for freshest texture. Alternatively, freeze fully finished brownies and thaw overnight before cutting.
  • Use peppermint extract for true mint flavor rather than mint extract which tastes more like spearmint toothpaste.
  • For smaller batches using a 9-inch square pan, halve the frosting and chocolate topping amounts accordingly but keep brownie batter quantities the same.
  • Use parchment paper with an overhang for easy removal of brownies from the pan.
  • Use a sharp large knife and wipe between cuts to ensure neat slices.

Nutrition

  • Serving Size: 1 brownie
  • Calories: 320 kcal
  • Sugar: 30 g
  • Sodium: 120 mg
  • Fat: 20 g
  • Saturated Fat: 12 g
  • Unsaturated Fat: 8 g
  • Trans Fat: 0 g
  • Carbohydrates: 35 g
  • Fiber: 3 g
  • Protein: 3 g
  • Cholesterol: 70 mg

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