Prepare the chocolate cookie dough by combining the flour, cocoa powder, baking soda, salt and confectioners sugar in a large mixing bowl.
Blend on low speed to combine, the add the diced cold vegan butter and continue blending on low to medium speed. It will seem that this is taking forever to come together and you will think there is something wrong with the recipe. Just wait. It may take 5 minutes or more
It will eventually come together and at that point you can add the vanilla extract and blend on high for 10 seconds to incorporate well.
Turn the very soft, sticky dough out onto a piece of plastic wrap or parchment paper (the plastic is way easier though) and then place another piece over top
Roll to about ¼" thickness as shown in the video.
Cut the dough with a 1¾" cookie cutter (dip the cutter in flour to make sure they don't stick in your cutter) and place them spaced ½" apart on a parchment lined (or non stick) sheet pan.
Bake in a preheated 350°F oven for 10-12 minutes and then transfer them to a cooling rack
Notes
Thin mints can be stored at room temperature in an airtight container for up to 2 weeks, or frozen for 3 months
Recipe by Gretchen's Vegan Bakery at https://www.gretchensveganbakery.com/vegan-thin-mints/