Recipes using Thin Mints are so good! If you agree, you'll make this minty Key lime custard in a Girl Scout Thin Mint cookie crust. This fresh, creamy dessert is beautiful, unique and oh-so-tasty! As far as Girl Scout cookie recipes go, this one is a must try!

UPDATE - This recipe won 1st place in the Greater Los Angeles Girl Scout Cookie Contest in conjunction with Melissa’s Produce. I guess recipes using thin mints are winners. 😉 You can see a few more of the entries here.

Between the Tagalongs and Samoas — sheesh, it's hard to eat a whole box.
Oh, and Thin Mint Girl Scout cookies are right up there, too. I mean, who doesn’t love a Thin Mint!? (You can check out all of the Girl Scout cookie recipes here.)

This ultra delicious Thin Mint Key Lime Tart is what I came up with, and I love it!
The mint flavor with the fresh lime is bright and lovely, and comes to you in an incredibly creamy, rich custard that rests in a crisp crust made from the Thin Mint Girl Scout cookies. It's a perfect blend of flavors and textures.

More Girl Scout Cookie Recipes
And as long as we're talking tarts, you won't want to miss this Chocolate Tart with a Pistachio Crust!
From the Girl Scouts of Los Angeles ...
- 2017 marks 100 years of Girl Scouts selling cookies to fuel their dreams!
- Girl Scout Cookies are on sale in Greater Los Angeles through March 12. Find a cookie sale near you by going to girlscoutcookies.org. Cookies are $5/box, except for the two specialty cookies: gluten-free Tofee-tastic and non-GMO Girl Scout S'mores, which are $6/box.
- Girl Scouts of Greater Los Angeles social media -- Twitter & Instagram: @GirlScoutsLA / Facebook: facebook.com/GSGLA
This is not a sponsored post. I was sent Girl Scout cookies from the Girl Scouts of Los Angeles to test recipes using Thin Mints, and Key limes from Melissa's Produce for more recipe testing.

Thin Mint Key Lime Tart Recipe
Ingredients
For the crust
- 1¼ boxes Thin Mints Girl Scouts cookies (2 dozen cookies)
- 6 tablespoons unsalted butter, melted
For the filling
- 8 ounces cream cheese, softened
- ¾ cup granulated sugar
- zest of 2 Key limes
- 3 tablespoons Key lime juice, from about 5 Key limes
- 2 tablespoons green Crème de Menthe
- 6 large eggs
For the garnish
- 1 tablespoon Thin Mints Girl Scouts cookies, finely ground (saved from above)
- a few thin Key lime slices
- a few small mint leaves
Instructions
- Add the Thin Mints to a food processor fitted with the blade attachment. Pulse until they’re a fine powder. Remove 1 tablespoon and set it aside for garnish. Then add the rest to a medium-sized mixing bowl and stir in the melted butter. Mix until it’s evenly blended. Then using your hands, evenly press the mixture into a 9½-inch tart pan with a removable bottom. Set aside.
- In a large, heat proof, medium-sized mixing bowl (stainless steel is great), whisk the cream cheese with the sugar. It’s best to use an electric mixer — for the smoothest possible result. Add the Key lime zest and juice, and Crème de Menthe. Mix again until smooth. Then, gradually add the eggs, one at a time, mixing between each addition.
- Place the bowl over a pot it fits snugly into, with a couple of inches of water in it. (Be sure the bottom of the bowl doesn’t touch the water.) Turn the heat to medium and whisking almost constantly, cook until the mixture is creamy and thick, like custard. This should take about 20 minutes. Remove it from the heat and let it cool to room temperature.
- Pour the cooled custard into the prepared tart crust and place in the refrigerator for at least 4 hours.
- Sprinkle the reserved 1 tablespoon on top and add a few Key lime slices and mint leaves. Place the tart in the freezer for 30 minutes before slicing — it will be easier to cut this way.
NOTES
NUTRITION





Chris
Perfect pairing of flavors, love it!! Thank you for this recipe and congratulations on winning the contest: well-deserved!
Valentina
Thanks so much! Hope you try and love it! 🙂 ~Valentina
Deb|EastofEdenCooking
What a winning recipe! Bravo Valentina! I also adore Thin Mints AND citrus desserts! A big fat slice of this fab tart would certainly make my day complete.
valentina
Aww thank you Deb! I've been LOVING all of the beautiful citrus on East of Eden!
Chris
This looks absolutely gorgeous! Admittedly I don't have much of a sweet tooth, but think this could actually be incredibly tasty! Stunning photography too 🙂
valentina
Thanks so much Chris. I'm a bit jealous of anyone without much of a sweet tooth. My rules my life. 😉
Dannii
Big congratulations! I love a lime dessert - it always tastes so refreshing.
valentina
Thank you! I think citrus season is the best!
Jere Cassidy
Well, who doesn't like those thin mints? Good use of them in this recipe.
valentina
I know, right!? Ha! Thank you. 🙂
K.C.
I can't wait to try this! A minty chocolate crust sounds WOW for the key lime. I have to have gluten free, so I use Goodie Girl Mint Slims. Maybe next year GS will come out with a gluten free thin mint.
valentina
Hi there! My son has Celiac and is GF, too. I'm so happy you mentioned the Goodie Slims -- I'm going to get them and make this for him. And thanks for stopping by. 🙂
Tara
Congratulations on winning first place! I can see why you won. This tart looks absolutely incredible!
valentina
Aww, thanks so much Tara! 🙂
Patricia@FreshFoodinaFlash
Congratulations to the 2017 winner, Valentina. This Minty Chocolaty confection is brilliant. Now you need to enter the national Girl Scout Cookie contest with this winning recipe.
valentina
From you, that's a HUGE compliment. THANK YOU, Patricia! XOXO