In a large bowl with a paddle attachment, mix brown sugar and butter, mix for 3-5 min, make sure you scrap the sides of the bowls a few times.  

Once the butter sugar mixture is pale in color, add the vanilla extract and continue mixing for a few more minutes. 

 In another bowl combine almond flour, arrowroot flour, cacao powder, baking soda and salt make sure to mix and set aside.

Next add the dry ingredients to the butter and sugar mixture and mix on low speed until combined.

Last add the dark chocolate chips, and mix all together. 

Scoop dough onto plastic wrap and roll it together into a log, about the width of the plastic wrap. 

Place in the fridge to rest and cool for at least an hour. Slice into about ½” thick slices and and bake at 325 degrees for 10-12 minutes.