Ultimate Thin Mint Brownies are four layers of chocolate mint heaven! A fudge brownie layer, topped with a creamy Thin Mint truffles layer, followed by whipped chocolate ganache frosting, and crushed Thin Mint Cookies.

Thin Mint Truffle Brownies  on a white plate with Thin Mint cookies

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I love this time of year! Spring is just around the corner and more importantly, Girl Scout Cookies are everywhere! Although I love the Girl Scouts, and used to be one, I think that the Girl Scout organization should really rethink their cookie model. They usually begin selling cookies in January when New Year’s Resolutions are in full swing and I’m usually trying to eat healthy. Hence, I only order one or two boxes of cookies. By the time March comes around, delicious Girl Scout Cookies begin to be delivered to those smart people that were ordered them months before. I’m usually hungry and wishing that I had ordered more. Lucky for me, there are usually little booths set up outside the grocery store with cute little Girl Scouts eager to unload their extra cookies to me. Winning!

My favorite Girl Scout Cookies are Samoas, Tag-alongs and Thin Mints. I love taking these cookies, that are already super delicious, and making them into a yummy treat. That’s where the idea came for Ultimate Brownies. These brownies are amazing! They are rich and creamy and have just enough mint flavor to not overpower the chocolate. Yum.

Thin Mint Brownies stacked high o a white plate.

Layers of Thin Mint Brownies

The bottom layer of these brownies is chewy and rich. On top of the brownie is a layer of Thin Mint cookie crumbs mixed with cream cheese. Just like an OREO truffle but with Thin Mints. The frosting is whipped chocolate ganache that tastes like a super creamy, minty, chocolate whipped cream that is heavenly! Finally, the brownies are sprinkled with crushed Thin Mint cookies.

They aren’t too hard to make either. Just follow the recipe step by step and you will be enjoying these delicious, decadent Thin Mint Truffle Brownies with Whipped Ganache Frosting in no time!

Ingredients for Thin Mint Brownies

Brownie Layer

-Butter

-Cocoa Powder

-Eggs

-Sugar

-Vanilla

-All Purpose Flour

-Salt

-Baking Soda

Thin Mint Truffle Layer

-Thin Mint Cookies

-Cream Cheese

Whipped Chocolate Ganache

-Heavy Cream

-Chocolate Chips

Topping

-Thin Mint Cookies

Helpful Kitchen Tools

-9×13 Baking Dish

-Parchment Paper

-Hand Mixer

How to Make Thin Mint Brownies

Begin by making the brownie layer.  Mix the cocoa powder with the melted butter. Beat the eggs and slowly add the sugar.  Mix in the vanilla and chocolate mixture.  Combine the flour, salt and baking soda together in a separate bowl and then add to the wet ingredients. The batter will be thick.

Brownie batter in a white bowl to make Thin Mint Brownies

Prepare a 9×13 pan by either spraying it with cooking spray or lining the pan with parchment paper. Pour in the batter and bake at 350 degrees for about 30 minutes until a toothpick inserted in the middle comes out clean. Allow the brownies to cool completely.

Brownie batter spread in a pan to make Thin Mint Brownies

While the brownies are cooling, you can prepare the truffle layer. If actual Thin Mints are not available, most groceries sell some type of chocolate mint cookie which can totally be substituted.

Crushed Thin Mints and a block of cream cheese to make Thin Mint Brownies

Crush the cookies into fine crumbs by smashing them with a rolling pin, or using a blender (that’s what I did) or food processor.

Cream cheese and crushed Thin Mint cookies mixed together to make Thin Mint Brownies

Mix the cookie crumbs together with the softened cream cheese until it is completely moist. Spread on top of the cooled brownies.

Thin Mint truffle layer spread over the brownie batter layer to make Thin Mint Brownies

To make the Whipped Ganache, place the chocolate chips in a microwave safe bowl and pour the heavy cream over them.

Cream and chocolate chips in a bowl to make Thin Mint Brownies

Microwave them on 50% power for 30 seconds then remove and stir. Continue to microwave in 30 second increments, stirring in between, until the chocolate is completely melted and incorporated with the heavy cream.

Chocolate ganache in a bowl with a spoon to make Thin Mint Brownies

Refrigerate the ganache until it is thick enough to not fall off the spoon. Place the chocolate in the bowl of a stand mixture and whip it  until it is light and fluffy.

A whisk of whipped chocolate ganache to make Thin Mint Brownies

Spread the ganache over the truffle layer.  Sprinkle more crushed cookies over the top and press them down lightly into the ganache. Refrigerate the brownies for 15-20 minutes before cutting.

Crushed Thin Mint cookies on top of Thin Mint Brownies

If you lined your pan with parchment paper, use both hands to lift the brownies out of the pan. Use a sharp knife to cut the edges off the brownies then slice to the desired size. Refrigerate the brownies until you are ready to serve them.

A close up picture of Thin Mint  Brownies

I hope you enjoy Thin Mint Truffle Brownies with Whipped Ganache Frosting! Check out more recipes here!

A close up of a Thin Mint Brownie with a bite taken out
Print Recipe
Thin Mint Truffle Brownies with Whipped Ganache Frosting
Four layers of Chocolate Mint heaven! Brownies topped with Thin Mint Truffles, whipped chocolate ganache frosting and crushed Thin Mint Cookies.
Course Dessert
Cuisine American
Keyword Dessert, Homemade
Prep Time 45 Minutes
Cook Time 30 Minutes
Passive Time 30 Minutes
Servings
Brownies
Ingredients
Brownie Layer
Thin Mint Truffle Layer
Whipped Chocolate Ganache
Course Dessert
Cuisine American
Keyword Dessert, Homemade
Prep Time 45 Minutes
Cook Time 30 Minutes
Passive Time 30 Minutes
Servings
Brownies
Ingredients
Brownie Layer
Thin Mint Truffle Layer
Whipped Chocolate Ganache
Instructions
Brownie Layer
  1. Melt the butter and stir in the cocoa powder. Set aside to cool. Beat the eggs and slowly add the sugar and vanilla. Add the cooled chocolate mixture and stir to combine.
  2. In separate bowl, mix the flour, salt and baking soda. Add to the wet ingredients and stir until moistened. Batter will be thick.
  3. Prepare a 9x13 pan by spraying with cooking spray or lining with parchment paper. Pour the batter into the pan and bake at 350 degrees for about 30 minutes until a toothpick inserted in the middle comes out clean. Remove from the oven and allow to cool completely.
Thin Mint Truffle Layer
  1. Using a food processor, blender or rolling pin, crush the Thin Mint cookies until you have fine crumbs.
  2. Pour into a bowl and stir with the softened cream cheese until totally incorporated and moist. Spread over the cooled brownies.
Whipped Chocolate Ganache Frosting
  1. Place the chocolate chips in a microwave-safe bowl and pour the cream over the top. Microwave at 50% power for 30 seconds. Remove and stir. Continue to microwave in 30 second increments until the chocolate chips are melted and are incorporated with the cream.
  2. Refrigerate the ganache until it is thick enough that it doesn't fall off the spoon.
  3. Place the ganache in the bowl of a stand mixer and whip until light and fluffy, about 4-5 minutes. Spread over the top of the Thin Mint Truffle layer. Sprinkle the cookie crumbs over the ganache and gently press them down.
  4. Refrigerate 15-20 minutes before cutting. Store them in the refrigerator until ready to serve.
How to cut the Brownies
  1. If you used parchment paper to line your pan, remove the brownies by lifting on the parchment with a hand on each side. Slice off the edges of the brownies and then cut them to the desired size.
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