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These Thin Mint Brownies are super fudgy, chocolatey brownies topped with Thin Mint Buttercream frosting! They’re just like the classic Girl Scout Cookies but in irresistible brownie form.Thin Mint Brownies made with Thin Mint Cookies! These are SO good! Super fudgy brownies with Thin Mint Buttercream Frosting. You can make these even if you don't have Thin Mints on hand.

Every month Kevin has a staff meeting at work, and I usually try to send in a little treat for his co-workers to make the day a little sweeter. :) Last month I made Red Velvet Brownies and they were a MASSIVE hit. He had several requests for the recipe before I was able to get it up on the blog. They were so popular he asked if I could do something similar for the next meeting. So this month, in honor of St. Patrick’s Day, I made Thin Mint Brownies!

Thin Mint Brownies made with Thin Mint Cookies! These are SO good! Super fudgy brownies with Thin Mint Buttercream Frosting. You can make these even if you don't have Thin Mints on hand.

And they are seriously to-die-for. We loved them, and everyone else must have too, because after the meeting Kevin texted me a picture of the empty plate. There was not a crumb left! :)

They are super easy to make, too. Here’s all you’ll need!

Thin Mint Brownies made with Thin Mint Cookies! These are SO good! Super fudgy brownies with Thin Mint Buttercream Frosting. You can make these even if you don't have Thin Mints on hand.

Now after all, these ARE Thin Mint Brownies…. HOWEVER. I don’t know about you, but I couldn’t bear to part with my beloved Thin Mints!!! I want to eat them an entire sleeve at at time. Preferably while locked in a closet so no one can disturb me. SO. I used these Keebler Grasshopper Cookies instead. They were honestly just as good! But you could definitely use Thin Mints here if you have a box to spare, maybe there’s one still in the freezer from last year. :)

Thin Mint Brownies made with Thin Mint Cookies! These are SO good! Super fudgy brownies with Thin Mint Buttercream Frosting. You can make these even if you don't have Thin Mints on hand.

I also used these fun Mint-Filled baking chips from Nestle. Have you seen them in stores? I am obsessed with them. They also have peanut butter, caramel, and cherry flavored chips. The peanut butter chips are my FAVORITE! If you can’t find these, you can use regular mint chocolate chips, chopped Andes mints, regular chocolate chips, or you can also just leave them out. :)

Thin Mint Brownies made with Thin Mint Cookies! These are SO good! Super fudgy brownies with Thin Mint Buttercream Frosting. You can make these even if you don't have Thin Mints on hand.

How to Make Thin Mint Brownies

To start, beat together the Devil’s Food Cake mix with melted butter and 2 eggs until well combined and you have a soft dough.

Thin Mint Brownies made with Thin Mint Cookies! These are SO good! Super fudgy brownies with Thin Mint Buttercream Frosting. You can make these even if you don't have Thin Mints on hand.

Then add the mint chocolate chips and stir until evenly distributed.

Thin Mint Brownies made with Thin Mint Cookies! These are SO good! Super fudgy brownies with Thin Mint Buttercream Frosting. You can make these even if you don't have Thin Mints on hand.

Press the dough into the bottom of a well-greased 9×13 baking dish. I like to line my dish with foil and also coat with cooking spray, because it makes the brownies so much easier to remove from the pan and cut into squares. Here’s my trick that makes lining a pan with foil SO much faster.

Thin Mint Brownies made with Thin Mint Cookies! These are SO good! Super fudgy brownies with Thin Mint Buttercream Frosting. You can make these even if you don't have Thin Mints on hand.

Bake the brownies for 15 minutes until the edges are just set. The middle may still be a little jiggly, but will set up completely once cooled. Do not overbake.

Thin Mint Brownies made with Thin Mint Cookies! These are SO good! Super fudgy brownies with Thin Mint Buttercream Frosting. You can make these even if you don't have Thin Mints on hand.

Now for the frosting! Finely crush the Thin Mints in a food processor or Ziploc bag.

Thin Mint Brownies made with Thin Mint Cookies! These are SO good! Super fudgy brownies with Thin Mint Buttercream Frosting. You can make these even if you don't have Thin Mints on hand.

Beat together with butter and powdered sugar until light and fluffy.

Thin Mint Brownies made with Thin Mint Cookies! These are SO good! Super fudgy brownies with Thin Mint Buttercream Frosting. You can make these even if you don't have Thin Mints on hand.

Thin Mint Frosting! So good!

Thin Mint Brownies made with Thin Mint Cookies! These are SO good! Super fudgy brownies with Thin Mint Buttercream Frosting. You can make these even if you don't have Thin Mints on hand.

When the brownies have cooled completely, top with frosting and mini chocolate chips.

Thin Mint Brownies made with Thin Mint Cookies! These are SO good! Super fudgy brownies with Thin Mint Buttercream Frosting. You can make these even if you don't have Thin Mints on hand.

Mint Chocolate Chip Brownie Perfection!! Hope you enjoy!! :)

Thin Mint Brownies made with Thin Mint Cookies! These are SO good! Super fudgy brownies with Thin Mint Buttercream Frosting. You can make these even if you don't have Thin Mints on hand.

Thin Mint Brownies made with Thin Mint Cookies! These are SO good! Super fudgy brownies with Thin Mint Buttercream Frosting. You can make these even if you don't have Thin Mints on hand.

Thin Mint Brownies made with Thin Mint Cookies! These are SO good! Super fudgy brownies with Thin Mint Buttercream Frosting. You can make these even if you don't have Thin Mints on hand.

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Thin Mint Brownies

  • Prep Time: 10 minutes
  • Cook Time: 15 minutes
  • Total Time: 25 minutes
  • Yield: About 20 Brownies 1x
  • Category: Dessert
  • Method: Oven
  • Cuisine: American

Description

These Thin Mint Brownies are super fudgy, chocolatey brownies topped with Thin Mint Buttercream frosting! They’re just like the classic Girl Scout Cookies but in irresistible brownie form.

Scale

Ingredients

  • 1 (16.5 oz) box Devil’s Food Cake mix
  • 2 eggs
  • 1/2 cup butter, melted
  • 1 (9 oz) bag mint chocolate chips
  • 1 (9 oz) box Thin Mints (about 30 cookies)
  • 2 cups powdered sugar
  • 1 cup butter, softened
  • 1 (12 oz) bag mini chocolate chips

Instructions

  1. Preheat oven to 350 degrees F. Line a 9×13 baking dish with aluminum foil and coat generously with non-stick cooking spray.
  2. With a mixer, beat cake mix, eggs, and melted butter until well combined. Then stir in mint chocolate chips until evenly distributed. Press into the bottom of prepared pan, and bake in preheated oven for 15 minutes until the edges have just set. Allow to cool completely.
  3. For the frosting, crush the cookies in a Ziploc bag into fine crumbs. With the mixer again, beat the cookie crumbs, powdered sugar, and softened butter for 2-3 minutes until light and fluffy. Spread over cooled brownies and top with mini chocolate chips. Cut into squares and serve.

Keywords: thin mint recipe, mint brownies, cake mix brownies, fudgy brownies, fudgy brownies recipe, homemade brownies, homemade brownies recipe, homemade brownies easy, best homemade brownies, best brownies recipe, best brownies recipe ever

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19 Responses
  1. Almut

    Hallo Kevin & Amanda,
    Eure Seite ist toll mit schönen Rezepten die es so bei uns nicht gibt,
    Leider ist das Übersetzen schwierig, da es gewisse Dinge bei uns so nicht gibt.
    BITTE könnt Ihr einen Übersetzer auf Eurer Seite hinzufügen?
    Damit wäre es wesentlich leichter nachzuvollziehen was genau gebraucht wird.
    Mein gelerntes englisch scheint nicht zu genügen. Und gooogle oder andere Übersetzer bei uns schaffen das auch nicht.

    Hi Kevin & Amanda ,
    Your site is great with beautiful recipes that do not exist as with us ,
    Unfortunately the translation is difficult because there are not certain things with us that way.
    PLEASE You can add a translator on your side ?
    This would make it much easier to understand exactly what is needed.
    My gelerntes English does not seem to be enough. And gooogle or other translators with us can not do it well .

    erwichen 1 Tasche ??????????? I dont kmow

    Vielen Dank fürs lesen (hoffentlich konntet Ihr mein Englisch entziffern).

    Liebste Grüße,
    Almut

    Thank you for that read (hopefully could you my English decipher.

    Dearest greetings,
    Almut

  2. Kc

    Hi, I made these tonight and they came out extremely gooey, almost looking like it didn’t cook all the way. Is that the way they are supposed to be?

  3. Angie | Big Bear's Wife

    Thin Mints are one of my favorites and most of the time I shy away from buying them because I know I’m going to want to inhale all of them. LOVE the idea of making these brownies with the cake mix!

  4. Senika @ Foodie Blog Stalker

    Thin Mints hold a special place in my heart. And now that you’ve introduced me to Grasshoppers? THANK YOU. My waist line does not thank you but my taste buds are rejoicing. Can’t wait to make and eat these thin mint brownie wonders, pinned!

  5. Laura @ Laura's Culinary Adventures

    I’m sure your husband’s coworkers are really appreciative of your yummy treats! Your creamy frosting looks divine!

  6. Valerie

    there is probably a reason… wondering why you use cake mix as opposed to brownie mix for the brownies. ? I just have it in my mind that brownie mix would be better?

    1. Amanda

      Hi Valerie,

      You could certainly make these bars with a brownie mix instead of a cake mix, I just happen to prefer it with the cake mix. The way the cake mix, eggs, and butter are combined, the bars turn out ultra soft, gooey, and fudgy. With this method the cake mix bars definitely turn out more fudgy and dense like brownies than light and fluffy cake. I prefer this flavor/texture to the way a brownie mix comes out.

      Hope this helps!
      Amanda

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Kevin and Amanda

We love to travel and to eat! Here we share our favorite quick and easy recipes, plus travel tips and guides for our favorite places around the world. Meet our Boston Terriers. Take a tour of our house. If you have any questions about what camera I use or how I edit my photos, check out my photography tutorials.

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