Thin Mint Mississippi Mud Brownies


Thin Mint Mississippi Mud Brownies


Those stinking Girl Scouts. They get me every darn year with the lure of Thin Mints. Gosh dang I love those cookies. I’ve tried making my own, but I didn’t like them. I’ve tried waiting on the little one to come to my door but we had two years where we paid and never got our cookies and to be honest I’m not even sure if they’re allowed to go door to door anymore. Which I’m totally on board with. It’s too scary to send your little one around. Anyway, years ago I was throwing my guts up from this pregnancy and my sweet friend from Brin and Bell wrote a guest post for me about devilishly delicious mint cookies and they got me thinking, why not create a Thin Mint Mississippi Mud Brownies recipe to get that flavor in my belly without having to wait on those girls to line up outside of Walmart.


Thin Mint Mississippi Mud Brownies


I can just taste those frozen cookies! Do you freeze yours too? It’s pretty much the best way to enjoy a thin mint cookie.


Thin Mint Mississippi Mud Brownies


So here’s the plan, since thin mint is my favorite girl scout cookie (sorry to Cade who loves the Samoas just as much) I’m having Amber from Dessert Now, Dinner Later work on a huge 100 recipe roundup of the best of the best thin mint recipes. Sounds fun right?! I can’t wait to get to it! Stay tuned!


Thin Mint Mississippi Mud Brownies


When I was little the Girl Scouts would come around to our door and oh my goodness, joy filled the entire house when they finally arrived to deliver our cookies. It was like this crazy balance between wanting to eat the cookies before they were gone and you didn’t get your fill and trying to hang onto them and savor every single cookie. That’s a pretty hard thing to do with Girl Scout cookies. And seriously, who made those dang things up?! I never, ever care about packaged cookies but there is just nothing in the world that compares to those green boxes!


Thin Mint Mississippi Mud Brownies


These brownies though, they are pretty fantastic and totally have that delicious thin mint awesomeness. Gooey, chocolatey brownie, andes mints, fluffy marshmallow and a perfectly rich chocolate frosting. Yeah, I’m pretty sold on these babies. Oh, and I do a little something special to make these brownies even more delicious and to taste a little more homemade, I sub butter for the oil. Melted butter that is. Try it, they are even more chocolatey and delicious.


Can Brownies Be Frozen?

Brownies can be frozen for up to 3 months.

Wrap them tightly in plastic wrap or foil, or place them in a heavy duty freezer bag and freeze.


Can You Use Salted Butter Instead of Unsalted?

If you’re baking a recipe that calls for unsalted butter (or doesn’t specify a butter) and you only have salted on hand, you can eliminate the added salt and still have a fabulous treat on your hands!



Thin Mint Mississippi Mud Brownies
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Thin Mint Mississippi Mud Brownies

Prep Time2 mins
Cook Time30 mins
Total Time32 mins
Course: 100 Best Brownies and Bars Recipes
Keyword: andes mints, brownies, dessert, girl scout cookies, marshmallows, thin mint
Servings: 12 servings
Calories: 522kcal
Author: Sweet Basil


  • 1 box brownie mix
  • Measurement for oil for the brownies but instead use the equivalent of melted butter
  • 1 package andes mints pieces found by the chocolate chips
  • 2 1/2 Cups Mini Marshmallows

Chocolate Frosting

  • 3/4 cup of unsalted butter softened
  • 1/2 cup of cocoa powder
  • 3 Cups Powdered Sugar
  • 1/4 teaspoon salt
  • 1/2 teaspoon vanilla
  • 2 tablespoons milk or more if needed


  • Mix the brownie mix according to instructions but use melted butter instead of oil.
  • Place in a 9x13" baking pan.
  • Bake according to directions, removing from the oven 5 minutes prior to being done.
  • Top with andes mints and marshmallows and place back in the oven for an additional 3-5 minutes.
  • Remove from the oven and allow to cool for 10 minutes.

For the frosting

  • Place the butter in a bowl and using a mixer or hand mixer, beat until smooth.
  • Add the powdered sugar, cocoa, salt and vanilla and slowly begin mixing, adding 1 tablespoon of milk as needed.
  • Frost the brownies and serve immediately or wrap with foil to be served later.


Serving: 1g | Calories: 522kcal | Carbohydrates: 83g | Protein: 3.8g | Cholesterol: 33.6mg | Fiber: 1.8g | Sugar: 66g
Tried this recipe?Mention @OhSweetBasil or tag #OhSweetBasil!


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Carrian Cheney

Lover of all things beautiful, good and delicious. Wife, mother, friend, foodie.

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27 comments on “Thin Mint Mississippi Mud Brownies”

  1. Pingback: Mint Oreo Mississippi Mud Brownies

  2. I made these the other day, they were delicious!!! Thanks for the great recipe!

  3. Guess who is making these tonight? That’s right, this girl is! I am already gaining more this pregnancy than my past 2, and I have a sneaking suspicion that these are not going to help! Haha!!!

  4. Oh my, these look divine!! I am going crazy looking at these

  5. These look gooey and delicious! I could eat a whole pan full!

  6. This looks incredible! I wanna stuff my face in them! Yes, I definitely freeze my thin mints!!

  7. Love how fudgy and gooey these look! So good!

  8. This sounds incredible! Just wondering…should I be concerned about those two rogue bullets beneath the two tablespoons butter listed for the frosting? Want to be sure there aren’t two critical ingredients that went AWOL, before I try this.

  9. Insane…in the best way of course! I would eat them all!

  10. I would probably eat them all! So delicious!

  11. of course I freeze thin mints!!!

    These brownies are straight up GENIUS! They look sooo gooey and decadent and over the top delicious!!!

  12. These look so good, yes I freeze my too. There are a couple of girl scouts that live on my street so I am covered for now. Pinning this.

  13. Gaaaah I forgot how much I love Missississippi (<— i thought so hard about this and this is what I got) mud cake!! adding mint? I love this idea and if I weren't currently working on an entire pan of undercooked sugar cookie bars then I would be in my kitchen right now. But this is totally the next thing I am baking Carrian.

  14. Thin mint and brownies? That’s a winning combo in my book. These look incredible! Great job.

  15. You are KILLING it with these thin mint recipes Carrian! I’m head over heels in love with these!

  16. This is just NOT fair to see first thing in the morning! 🙂 YUM.

  17. Frozen thin mints are the best! I actually freeze all my chocolate…it’s just better that way.
    These look insanely delicious and moist..and SO EASY.