Beyond Frosting » Recipes » Desserts » Cookies » Thin Mint Brookies

Thin Mint Brookies

Homemade Brookies with a twist, these are loaded with Thin Mint Cookies. If you have some extra Girl Scout Cookies laying around, try these brookie bars.

three thin mint brookies stacked on a small cupcake stand

Girl Scout Cookie Season is upon us, and I for one could not be more excited. I may be jumping the gun here, but I really just couldn’t wait to share this recipe with you.

As a child, I participated in Girl Scouts until I was “too cool” around 4th or 5th grade. That doesn’t mean I stopped buying the cookies though! It’s incredibly hard to resist those adorable little girls outside of the store asking “do you want to buy some cookies?” Umm YES PLEASE.

five thin mint cookies stacked with a brookie on top

Thin Mints are hands down my favorite, it just doesn’t get better than that. So when I overload my freezer with Thin Mints every year, I need an excuse to get rid of them. As such, the Thin Mint Brookie was born.

If you’re looking for a similar treat without mint, be sure to check out these chocolate chip cookie brookies!

side view of three cookie bars stacked on a small cupcake stand

This recipe combines a fudgy brownie with a chocolate chip cookie loaded with chocolate chips and Thin Mint cookies. If you can find the mint chocolate chips, these are even better with the mint flavored ones.

For added mint flavor in this recipe, substitute some of vanilla extract with mint extract.

I made the cookie dough from scratch, but you can make it easier on yourself by using some prepared refrigerated cookie dough from the store, but I love the softness of the cookie made from the dough I use. 

overhead of three cookie bars stacked on a piece of parchment paper

This brookie is one of those “red light” desserts for me – meaning I had to get rid of them immediately after photographing in fear of eating the whole pan myself. Fact.

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five thin mint cookies stacked with a brookie on top

Thin Mint Brookies

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  • Author: Julianne Dell
  • Prep Time: 45 minutes
  • Cook Time: 35 minutes
  • Total Time: 1 hour 20 minutes
  • Yield: 18-21 servings
  • Category: Cookies
  • Method: Oven
  • Cuisine: American


  • 1 Sleeve Thin Mints

For the Cookie Dough

  • ¾ cup (170g) unsalted butter, softened
  • ¾ cup (165g) packed light brown sugar
  • ¼ cup + 2 tablespoons (60g) granulated sugar
  • 1 large egg
  • 1 large egg yolk
  • 1 tablespoon (15ml) pure vanilla extract
  • 1 ¾ cups + 2 tablespoons (254g) all-purpose flour
  • ¾ teaspoon salt
  • ¼ + 1/8 teaspoon baking soda
  • 1 cup (180g) chocolate chips

For the Brownie Layer

  • 6 ounces dark chocolate, melted
  • ¾ cup (170g) unsalted butter, melted
  • 1 ½ cups (285g) granulated sugar
  • 3 large eggs
  • 1 large egg yolk
  • 1 tablespoon (15ml) pure vanilla extract
  • ¾ cup (105g) all-purpose flour
  • ¾ cup (84g) cocoa powder, sifted
  • 1 teaspoon salt
  • ¾ teaspoon baking powder


  1. Preheat the oven to 350°F. Grease a 9×13-inch pan and line the bottom and sides with parchment paper. Allow the butter to soften for at least 20 minutes.
  2. Empty one sleeve of thin mints into a Ziploc bag. Crush cookies into smaller pieces using a rolling pin or wooden spoon. Set aside.

For the Cookie Dough

  1. Combine the softened butter with the brown and granulated sugar. Beat on medium speed until well combined, 2-3 minutes.
  2. Next add the egg, egg yolk and vanilla extract and continue beating until well incorporated.
  3. In a separate bowl, combine the flour, salt and baking soda. Stir to combine and slowly add the dry ingredients into the dough, mixing on low speed until dough starts to form. Before the dough thickens, add the chocolate chips and crushed Thin Mint Cookies. Beat until incorporated. Set aside.

For the Brownie Layer

  1. Chop the chocolate into smaller pieces and melt the chocolate in a microwave-safe bowl for approximately 2 minutes at 50% power. Stir occasionally and microwave until completed melted and smooth. Set aside to cool.
  2. Melt the butter in a microwave-safe bowl and combine with the granulated sugar; beat together until well combined.
  3. Next add the egg and egg yolk and beat for 60 seconds at a higher speed until the batter is fluffy (texture resembling a cake batter).
  4. Then add the vanilla extract and melted chocolate and beat until combined.
  5. Combine the dry ingredients in a separate bowl and stir to combine. Add the dry ingredients to the batter and mix just until combined.

To Assemble

  1. Pour the prepared brownie batter in the bottom of the pan. Then take large pieces of the cookie dough and press it flat with your hands, then press it into the brownie batter. Continue to layer all the remaining cookie dough.
  2. Bake at 350°F for 35-40 minutes. I suggest covering with aluminum foil after 15-20 minutes to prevent too much browning on top. Test for doneness by inserting a toothpick into the center. The brownie should be a little fudgy but not wet.


  • You can try making this recipe with a family-sized box of brownies.

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52 thoughts on “Thin Mint Brookies”

  1. Okay ladies, here is a tip for you.
    WalMart sells a Great Value version of Thin Mints. Priced at about 1.28 a pack. Guess what? Equally as good if not better than girl scout cookies (they have a generic tag along too!) So you could make this year round.

    Thanks for linking up to Tip Me Tuesday linky party this week. {knuckle bumps}
    Did you know that I can “lend” your blog posts my Google page rank for better search engine traffic?
    If you upload at least 2 images, 2 steps, and blog post URL into your Tip Junkie craft room, you’ll be in business!
    {wink} ~ Laurie {a.k.a. the Tip Junkie}

  2. I guess I never got “too cool” (or cool at all, really) because I was a girl scout all the way through high school and then was my daughter’s brownie leader for three years! Girl scout cookies are a permanent part of my genetic makeup by now! 🙂 I love your recipes using girl scout cookies, Julianne!!! I buy a LOT of boxes. After we eat a few and donate a few, there are still boxes left. Using the cookies inside another dessert makes them irresistible again! Thin mints are everyone’s favorite so these Brookies are sure to be a favorite too. Now I just have to hold out until the cookies are delivered!

    1. Julianne - Beyond Frosting
      Beyond Frosting

      Thank you Wendy. Right around 5th grade I decided that I was done with girl scouts and some other personal stuff was going on. Anyhow, I wish I had stuck with it longer

  3. This looks like paradise for the mouth! Thin mint has always been my favorite cookie, and I can’t help but marvel at your creation! New follower!

  4. Avatar photo

    Mmmm, thin mints 🙂 I could eat a box myself! And seriously, these brookies look so amazing!! The perfect way to use up any extras!

  5. Avatar photo
    Gloria // Simply Gloria

    Julianne, these bars are just genius! I was in the GS, too. In fact, I remember when my house was the house to hold all of the orders in for a few of the troops. There was a huge semi truck that dropped off loads of cases of cookies! We lived in a little farm town… so it was pretty funny to see the truck unloading at our house. Everyone would drive by and stop to watch. hehe
    I’m going to have to save some cookies to make these bars!

    1. Julianne - Beyond Frosting
      Beyond Frosting

      WHAT?! That sounds awesome! I remember that the delivery of cookies came to a local church and then we had to sort them out by troop and each troop had to come and pick up their boxes. Of coarse, we sold door to door and after leftover boxes, we sold at the grocery store check out.

  6. Avatar photo
    Heather @ French Press

    drooling over here, and now I need to hunt down some thin mints – it was SO fun meeting you this weekend

    1. Julianne - Beyond Frosting
      Beyond Frosting

      You too Heather! I am so glad I got a chance to meet you! Hopefully one day I can make it up there and get together with everyone for some coffee and cupcakes!

  7. Avatar photo
    Julie @ Julie's Eats & Treats

    Gorgeous pictures! I have a box of Thin Mints sitting here and this is calling their name!

  8. Avatar photo
    Erin | The Law Student's Wife

    OH MY, how I would love four of these with a glass of milk. My biggest challenge to making them would be stopping myself from eating the whole box of Thin Mints before I baked them!

  9. Avatar photo
    Lindsay @ Life, Love and Sugar

    I will hunt me down some girl scouts. Fact. These sounds perfectly minty and delicious! Sharing!

  10. Julianne these are phenomenal!! Seriously, I’m going to hide a box of thin mints so I can make these beauties!

  11. Avatar photo
    Beth @ bethcakes

    I’m so excited for Girl Scout cookie season too! I already have some stashed in my room so no one else can have them, haha. These brookies look wonderful and I love that you used Thin Mints in them! Very creative use of Girl Scout cookies. 🙂

  12. Avatar photo
    Shannon @ Bake.Frost.Repeat

    What?! Those brookies look amazing! I love the chocolate & mint combo too! Now I’m definitely going to have to order some cookies!!!

  13. Avatar photo
    Lindsey @ American Heritage Cooking

    Omg no you didn’t!!! I want to make these right now. But I have no thin mints! The cruelty!!!

    1. Julianne - Beyond Frosting
      Beyond Frosting

      AH! I supple you could substitute Keebler Mint Fudge cookies, BUT we all know those just aren’t the same!

      1. Avatar photo
        Lindsey @ American Heritage Cooking

        No they most certainly are not…I guess I’ll just have to wait until I nab some local girl scout cookies. I hear patience is a virtue! 😉