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Mint Fudge Brownies


Mint and chocolate are a delicious pairing, especially in these Mint Fudge Brownies. Chewy, chocolate brownies with a thick layer of minty buttercream frosting topped with a creamy, fudge layer on top. It’s the perfect dessert for this St. Patrick’s Day! Or every other day of the year! Every day is better with a Mint Fudge Brownie!

Brownie Lovin’

Brownies and mint are absolutely delicious together. Let’s be real though, anything goes with a brownie. I don’t think I’ve ever met a brownie that I didn’t like! These Mint Fudge Brownies might just take the cake though!

While this recipe is pretty easy, it does have quite a few steps that do require some chill time. To make things easier, I used a box mix so I could cut down on the dishes and ingredients I needed to use!

I love using store-bought shortcuts like this! It makes baking everything just a touch quicker (and easier) and you get to make these really ingredient dessert! 

If you really want to use a homemade brownie recipe, I have a full recipe for fudgy brownies you can use here!

Please note that I just followed the back of the brownie box directions to make the brownies. The box you get at the store might require different increments, but most will typically require some form of eggs, oil, and water! Just check to make sure you’re using the right measurements of everything! 

American Buttercream Basics

When it comes to frosting, there’s actually a lot of different types out there. There’s seven different types of buttercream, such as American, Swiss meringue, Italian meringue, French Buttercream, and German buttercream to name a few. 

My favorite to make is the traditional American buttercream. It’s definitely one of the easier buttercreams that only requires butter, heavy cream, and powdered sugar. The other buttercreams can sometimes require egg whites and I don’t always feel like dealing with egg whites, you know!? 

For my buttercream recipe, I like to mix the powdered sugar and butter together first. Then I add in the heavy cream and extract. Then I like to whip this mixture for about 5-7 minutes. It seems like a long time, but I think this is the key to really creating light and fluffy frosting. 

The longer that you mix the buttercream, the more air you are creating in the butter which is how you get light and fluffy buttercream. 

If you were going to use your buttercream for piping letters or flowers, you might want a stiffer buttercream that mix less to help create more intricate shapes. 

But if you’re just frosting a cake (or brownies in our case), light and fluffy is the way to go! 

Ingredient List:

Mint Buttercream:

Chocolate Fudge Topping:

Tips and Tricks

One tip to make sure these brownies turn out is to make sure each layer is cool before moving on to the next layer. Especially when you’re working with buttercream, you want to make sure the brownies are cool. If you add the buttercream to the brownies while they’re still hot, the buttercream will actually start to melt. It’s the same when adding the hot chocolate fudge topping. If the topping is too hot, it can melt the buttercream as well. 

Make sure each layer is cooled down before adding the next layer!

I like to add a little sprinkle of salt to the top of these brownies to really take them over the edge!

These Mint Fudge Brownies are rich and decadent with the perfect amount of minty flavor! I love the creamy smooth buttercream mixed with the fudgy brownie. 

What a lucky flavor combination!


-Holly Michelle  


Mint Fudge Brownies

Chewy, chocolate brownies with a thick layer of minty buttercream frosting topped with a creamy, fudge layer on top.
Course Dessert
Cuisine American
Keyword fudge brownies, fudge brownies recipe, mint brownie recipe, mint brownies, mint brownies recipe, mint fudge brownies, mint fudge recipe, st patricks day, st patricks day desserts, st pattys day, st pattys day desserts
Prep Time 10 minutes
Cook Time 45 minutes
Frosting: 10 minutes
Total Time 1 hour 5 minutes
Servings 16 Brownies


  • 1 box Brownie Mix
  • 2 Eggs
  • 1/2 cup Flavorless Oil
  • 3 tablespoons Water
  • 1/2 teaspoon Mint Extract

Mint Buttercream:

  • 2 sticks Butter room temperature
  • 2 1/2 cups Powdered Sugar
  • 3 tablespoons Heavy Cream
  • 1 teaspoon Mint Extract
  • Green Food Coloring optional

Chocolate Fudge Topping:

  • 2 cups Bittersweet Chocolate
  • 10 tablespoons Butter
  • 1/2 teaspoon Salt


  • Preheat oven to 325 degrees.
  • Following the directions on the back of the brownie mix, combing eggs, oil, and water. Add in mint extract and stir together.
  • Bake in a square pan for about 45 minutes.
  • Let cool completely and make the buttercream frosting.

Making the Buttercream:

  • Cream together butter and powdered sugar until light and fluffy.
  • Add in heavy cream, mint extract, and food coloring. Whip together for another 2-3 minutes.
  • Add buttercream to the top of the cooled brownies.

Making the Fudge Topping:

  • In a microwave-safe bowl, add in bittersweet chocolate and butter.
  • Melt in 30-second increments until fully melted.
  • Stir in salt and allow to cool for a few minutes.
  • Pour the cooled chocolate mixture on top of the mint buttercream and let harden.
  • Cut into squares and sprinkle a little salt on top!
  • Serve and enjoy!


If you are using a box brownie mix, please follow the directions for baking on the back of the box. The box I used required water, oil, and eggs, but the one you buy might be slightly different! 
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