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These Fudgy Frosted Chocolate Mint Brownies have a double layer of mint and chocolate frosting on top of a dense, fudgy brownie. If you are a fan of mint chocolate desserts, these are the brownies for you! Perfect for a St. Patrick’s Day dessert or for any day of the year.

If you are a brownie fanatic like me, make sure to try my Gooey Swirled Nutella Brownies, Irresistible Mississippi Mud Brownies, Easy Caramel Pecan Brownies, the best ever Cream Cheese Brownies, and these triple-decker Slutty Brownies.

several pieces of frosted mint brownie around a cakeplate with a piece of brownie on top

With St. Patrick’s Day coming up, I thought I would share these mint chocolate brownies that are a perfect dessert for America’s favorite Irish holiday.

When it comes to food for celebrating St. Patrick’s Day, and being part Irish myself, I love traditional Irish foods like Dublin Coddle with Sticky Toffee Pudding.

I’ve got a few more traditional Irish foods coming your way soon, but thought I would share these decidedly not Irish but still St. Patrick’s Day-themed brownies thanks for a few drops of green food coloring in the mint frosting layer of these fudgy frosted chocolate mint brownies first that are so much fun to make.

A pale green cake stand with three frosted brownies with mint chocolate frosting.

While definitely not Irish, the green stripe of mint frosting dresses these thick, rich brownies up in the appropriate color for the holiday and makes this a dessert that is perfectly sweet for celebrating in a less traditional sense.

Your little leprechauns will be very, very happy. Mine had more fun taste-testing these chocolate mint brownies than any other dessert I can remember. I mean, the basic brownies are fantastic by themselves and then you add not one but TWO layers of frosting? It’s kind of a no-brainer that kids will love them, right?

One fudgy frosted chocolate mint brownie with layers of chocolate and mint frosting on a plate with a bite taken out of it.
sliced servings of frosted mint brownies resting on and off plates or a cakestand

I did my undergrad and law school at BYU, and any alumni of that school will be all-too familiar with the famous BYU mint brownies that seemed to be omnipresent at any event catered by the school.

Sliced fudgy brownies with dark chocolate, mint frosting and chocolate frosting, on a pale green plate for St. Patrick's Day.

While definitely tasty, they were more of a “cakey” brownie, which I wanted to alter in my version of chocolate mint brownies.

And despite my undying love for walnuts in brownies, I don’t think walnuts and mint belong together, which is why I’m leaving them out here even though the original BYU mint brownies have walnuts.

So yeah, these aren’t exactly the same as the BYU mint brownies. But I daresay they are even better.

frosted mint brownie squares on and off plates one with a fork removing a bite

How to Make Fudgy Frosted Chocolate Mint Brownies

The brownie base starts out with semisweet chocolate that gets chopped up and melted with butter.

Then you whisk in granulated sugar AND brown sugar before adding in the eggs, one at a time. I don’t use brown sugar in my thick, fudgy brownies because using it in brownies makes it more difficult to get that crinkly, paper-thin layer on top that is the hallmark of box brownies.

But since these brownies are being frosted and that quality isn’t necessary here, I think brown sugar adds to the flavor of the brownie base.

  • mixing batter ingredients with red rubber spatula
  • whisking ingredients together in glass bowl
  • brownie batter being mixed together with red spatula in glass bowl

While you could add extra peppermint extract to the actual brownie base, if you wanted the mint to be really strong, I prefer it without. Mint is a powerful flavor and it’s easy to go overboard. I really think that it’s the balance of mint frosting with the chocolate brownie that makes this recipe work.

And while we are talking about mint, be sure to only use peppermint extract, not wintergreen. I learned this the hard way years ago after accidentally buying wintergreen flavoring and ending up with frosting that looked and tasted like toothpaste. Yuck.

Chocolate brownie batter being stirred by hand with a spatula.

After folding in the flour and cocoa powder with a spatula or wooden spoon, pour the batter into a pan lined with a parchment paper sling. The sling is super helpful in lifting the brownies out of the pan for easier, cleaner cutting.

Once the brownies are completely cooled, frost them with the mint frosting. The recipe as written is just the right amount for a thin layer that will cover the top of the brownies.

Once frosted, it’s helpful to pop the brownies into the freezer while you mix up the chocolate frosting. It gives the mint frosting just enough time to harden a bit so that when you spread the chocolate frosting the two layers don’t just mix together.

a fork full of frosted mint brownie on a plate
a slice of frosted mint brownie on a plate with a fork with more pieces nearby

Like many mint chocolate desserts, these taste amazing chilled, straight out of the fridge.

Are you a frosted brownies person or do you prefer them plain? Try these fudgy frosted chocolate mint brownies and let me know what you think in the comments below!

pieces of brownie around a cake stand and on a cake stand with a fork resting to the side

More Mint Desserts for Mint Lovers

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One fudgy frosted chocolate mint brownie with layers of chocolate and mint frosting on a plate with a bite taken out of it.
Yield: 24 brownies

Fudgy Frosted Chocolate Mint Brownies

These Fudgy Frosted Chocolate Mint Brownies have a double layer of mint and chocolate frosting on top of a dense, fudgy brownie.  If you are a fan of mint chocolate desserts, these are the brownies for you!  Perfect for a St. Patrick's Day dessert or for any day of the year!

Prep Time 25 minutes
Cook Time 35 minutes
Total Time 1 hour

Ingredients

Brownie

  • 1 cup butter
  • 8 ounces semi-sweet chocolate, chopped
  • 1 1/2 cups granulated sugar
  • 1/2 cup light brown sugar
  • 4 large eggs, at room temperature
  • 2 teaspoons vanilla
  • 1/2 teaspoon salt
  • 3/4 cup all-purpose flour
  • 1/4 cup cocoa powder

Mint Frosting

  • 5 tablespoons butter, softened
  • Dash of salt
  • 2 cups powdered sugar
  • 2-3 tablespoons milk
  • 1/2 teaspoon peppermint extract
  • 2-3 drops green food coloring

Chocolate Frosting

  • 5 tablespoons butter, softened
  • Dash of salt
  • 2 cups powdered sugar
  • 1/3 cup cocoa powder
  • 2-3 tablespoons milk
  • 1/2 teaspoon vanilla

Instructions

For the brownies:

  1. Melt the butter and chopped chocolate together in a large microwave-safe bowl by heating in 30 second increments, stirring between each burst of heat, until melted and smooth.  Allow the mixture to cool slightly for 10 minutes.
  2. Heat oven to 350 degrees.  Line a 9x13 baking pan with a parchment paper sling.  
  3. Whisk both sugars into the cooled chocolate and butter mixture.  Add the eggs, one at a time, whisking after each addition until smooth.  Add the vanilla, then add the salt, flour, and cocoa powder at the same time and gently fold them in using a rubber spatula or wooden spoon, until no streaks of flour or cocoa powder remain.
  4. Pour the brownie batter into the prepared baking pan and bake for 32-36 minutes, just until the brownies start to pull away from the edges of the pan and a toothpick inserted into the center of the brownies comes out with only a few moist crumbs clinging to it.  
  5. Remove from oven and cool completely in the pan before transferring them to a baking sheet using the parchment paper sling for easy removal.  

For the mint frosting:

  1. In a medium bowl using a handheld mixer, beat the butter until smooth and creamy.  Add the salt, powdered sugar, and milk and beat for 2 minutes on low speed, then add peppermint extract and food coloring and beat on high for 1 minute.  Taste and add more peppermint extract or green food coloring, if desired.  
  2. Frost the completely cooled brownies and transfer them to the freezer while you make the chocolate frosting to help the mint frosting "set" on top of the brownies.  

For the chocolate frosting:

  1. In a medium bowl using a handheld mixer, beat the butter until smooth and creamy. Add the salt, powdered sugar, cocoa powder, milk, and vanilla, then beat for 2 minutes on low speed.  Increase the speed to high and beat for 1 minute more. 
  2. Gently spread the chocolate frosting over the chilled layer of mint frosting.  Cut into squares and serve.  

Nutrition Information:

Yield:

24
Amount Per Serving: Calories: 339Saturated Fat: 10gCholesterol: 64mgSodium: 173mgCarbohydrates: 45gFiber: 1gSugar: 40gProtein: 2g
© Amy Nash, House of Nash Eats
Cuisine: American / Category: Dessert