Thin Mint Brownies

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Rich, fudgy homemade brownies are topped with a chocolate frosting and crushed Thin Mint cookies for a simple yet indulgent treat!

thin mint brownies box of thin mints and glass of milk

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Girl Scout cookie season is one of my very favorite times of year, and I know I’m not alone! I usually stock up on my favorite Girl Scout cookies and then freeze them to enjoy for months to come.

Thin Mints are my favorite Girl Scout cookie (close behind are those delicious Samoas!) and recently I experimented with using them in a few recipes to try new Thin Mint desserts. When I tested this Thin Mint brownie recipe my family raved about them and I knew we had a winner!

Do you love Thin Mints? Check out these Mint Chocolate Crinkle Cookies too!

chocolate thin mint brownies on white plate


  • butter
  • maple syrup
  • eggs
  • white sugar
  • cocoa powder
  • all-purpose flour
  • baking powder
  • salt
  • whipped chocolate frosting
  • Thin Mint cookies

Step by step

  1. Preheat the oven and spray a baking pan with nonstick cooking spray.
  2. Mix together the egg, butter, and maple syrup until blended.
  3. Add the dry ingredients and stir to mix.
  4. Pour the brownie batter into the prepared baking dish and bake for 25 minutes.
  5. Allow the brownies to cool completely on a cooling rack.
  6. Stir the frosting then spread over the cooled brownies before topping with the crushed cookies.


  • If you wanted to up the mint factor you can add peppermint extract to the frosting, just start with 1/4 teaspoon at a time though, mint extract is potent stuff! I found that they were plenty minty for my taste with just the crushed cookies on top.
  • Use a boxed brownie mix instead of making the brownies from scratch.
  • Add chocolate chips to the brownie batter before baking.
  • Dust with powdered sugar over the Thin Mints.
overhead view of thin mint brownies in white casserole dish

If you try this recipe please comment and rate it below, I love hearing from you!

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close up of thin mint brownie

Thin Mint Brownies


Rich, fudgy homemade brownies are topped with a chocolate frosting and crushed Thin Mint cookies for a simple yet indulgent treat!


Units Scale
  • 1 cup butter, melted
  • 2 tablespoons maple syrup
  • 4 eggs
  • 2 cup white sugar
  • 1/2 cup cocoa
  • 1 3/4 cup flour
  • 1/2 Tablespoon baking powder
  • 1/2 teaspoon salt
  • 12 oz . whipped chocolate frosting
  • 1 sleeve (about 16 cookies) Thin Mint cookies, crushed


  1. Preheat oven to 350 degrees. Spray a 9 by 11 inch baking pan with nonstick spray.
  2. In a large mixing bowl combine butter, eggs and maple syrup.
  3. Add cocoa, sugar, flour baking powder and salt and stir on low until combined.
  4. Pour into prepared dish and bake for 25 minutes.
  5. Allow to fully cool before frosting.
  6. Stir frosting well and spread over brownies. Top with crushed cookies.


Store brownies in an airtight container at room temperature for up to 5 days. 

Freeze brownies by wrapping in two layers of aluminum foil and one layer of plastic wrap and keep in the freezer up to 3 months. Thaw at room temperature overnight.

  • Prep Time: 15 min
  • Cook Time: 25 min
  • Category: dessert
  • Method: baking
  • Cuisine: American


  • Serving Size:
  • Calories: 336
  • Sugar: 40.3 g
  • Sodium: 191.8 mg
  • Fat: 12.4 g
  • Carbohydrates: 55.9 g
  • Protein: 4.7 g
  • Cholesterol: 49.6 mg

Keywords: thin mint brownies

overhead view of casserole dish with thin mint brownies

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