Name: Thin Mint Sandwich Cookies
Prep time: 30 min
Cook time: 30 min
Ingredients: 2 cups dark chocolate chips; 1 cup heavy whipping cream; 3/4 cups granulated sugar; 1 stick butter (softened); 1 large egg; 1 tsp vanilla; 1/2 tsp salt; 1/4 cup dutched black cocoa powder ((can use all brown cocoa)); 1/ cup dutched brown cocoa powder ((can use all brown cocoa)); 1 1/2 cups all purpose flour; 1 tsp peppermint extract; 1 cup dark (semi sweet or milk chocolate melting wafers or bark (melted until smooth))

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Rich, dark chocolate ganache, sandwiched between the darkest chocolate cookies, and drizzled with milk chocolate.

These Thin Mint Sandwich Cookies are delightfully rich dark chocolate ganache sandwiched between two dark chocolate butter cookies, and then drizzled with dark chocolate ribbons. They make the perfect holiday cookie plate for your kitchen counter, and great Christmas gifts! For another great Holiday Cookie, try these super soft, thick and chewy Molasses Cookies.

Using dutch process cocoa

The cocoa in this recipe is everything. You may notice, that I am a Dutch processed cocoa girl all the way. I talk a little bit about what Dutch processed cocoa is in my "unboxed Brownie Recipe", and how to make homemade brownies taste like boxed. The long and short of it is, that Dutch processed cocoa doesn't have the acidity of regular cocoa. It's smooth, mellow and oh-so addicting. I don't use anything else.

It's been my experience, that the best Dutch processed cocoa of a reasonable price comes from The Cocoa Trader. I've used other brands, but they lack the smoothness of The Cocoa Trader's and also, they have the best black cocoa. That's what's in these cookies. Think of the taste of black cocoa akin to the Oreo cookie. I order from Amazon, and I must make it clear that any orders generated from clicking on the links below will earn me a commission. But I promise you, regardless, this is the cocoa I would send you to, hands down. Not only that, but it's much less costly than other Dutch processed cocoas out there.

Chocolate peppermint cookies

The recipe for the outer sandwich cookie was inspired by these Dark Chocolate Butter Cookies from King Arthur Flour. Except that instead of using the entire recipe, I use just the bottom cookie part, and tweak it a bit with peppermint extract. The dough is surprisingly easy to work with. You'll have no trouble at all using any cookie cutter shape with these. Just make sure to chill the dough first, and roll it between two pieces of parchment paper.

How to roll out even cookie dough

The best way to work with the cookie dough for the sandwiches is to begin by chilling the dough for at least 30 minutes in the refrigerator. Shape it into a thick rectangle or oval first, about an inch thick. This gives it a bit more structure and makes the edge pieces easy to pull away from the cut out cookie.

Once chilled, remove from the refrigerator, break off a portion of dough, and flatten it between two pieces of parchment paper. Using a rolling pin begin rolling from the center of the dough to the edges, across and back again until it is very thin, about ⅛th of an inch. Use a piece of parchment paper that will fit on a baking sheet. That way, you can peel away the excess dough and transfer the sheet directly to the baking sheet without having to lift off the cookie shapes.

how to use cookie cutters

Once the dough has been rolled out evenly to ⅛ of an inch thick, peel the top piece of parchment paper off from one corner to the other. Press your cookie cutter shapes all the way into the dough. The cookies will hardly rise or expand at all, so you can make the shapes very close together. A minimum of ½ inch apart is all you will need, and this will also allow you to easily pull up the excess.

Once cut, and all the excess removed from the paper, simply pick up the bottom piece of parchment paper with the cookie shapes on it and carefully transfer it to a baking sheet. Bake for 8-10 minutes. Cookies will feel soft, but they will set and harden up perfectly as they cool.

chocolate ganache filling

Chocolate ganache is one of those beautiful things that sounds fancy, and looks gorgeous, but is deceivingly easy to make. It consists of two ingredients, and you really don't even need to use the stove. Heavy cream and chocolate chips are all you will need.

Heat the cream (I do this in the microwave, 30 seconds at a time until very warm.) Pour the chocolate chips into the cream and give it a little jiggle so that they are all submerged. Then wait. And stir. And wait some more. And stir some more. Eventually, the chocolate will be completely melted and incorporated into the cream and you will have a silky, shiny beautiful chocolate ganache.

chocolate ganache ratio

There's no single ratio of cream to chocolate when making ganache. It varyies depending on what you're using the ganache for. For a pour-able ganache, you'd use about equal parts cream and chocolate; a 1:1 ratio. In the case of these Thin Mint Cookie Sandwiches, we go in the direction of a thicker ganache. For this reason, I've chosen to use 2 cups of chocolate with 1 cups heavy cream. This results in a more sturdy filling, that is still soft, but won't squish out the sides too bad when bitten into.

When the ganache first comes together, it is still warm so it is too thin to spread between the cookies. Either letting it set at room temperature, or setting it in the refrigerator will harden it up enough to spread and sandwich between the two cookies. If you make the ganache way ahead of time, store it in the refrigerator and let it come to room temp to soften up.

assembling the cookie sandwiches

With the cookies baked and completely cooled, and the ganache set to room temperature begin by spreading the ganache between two matching cookies. Make sure the cookie tops are facing out, so that the bottoms are inside of the sandwich.

Once all of the cookies have been made into sandwiches, lay them out next to each other on wax paper, foil, or other lined surface that can be easily cleaned up or thrown away. Microwave the melting chocolate in 30 second intervals, stirring in between. Once completely melted, microwave 20 seconds more to ensure that it is as thin as possible for drizzling.

Using a fork or whisk, dip into the melted chocolate and drizzle over the cookies. If the chocolate begins to get too thick to drizzle, just give it another 15 seconds in the microwave.

The Thin Mint Sandwich Cookies are done when the the chocolate drizzle has hardened to solid. Store covered, at room temperature for up to one week.

Happy cookie making!