In a large bowl, add softened butter (or preferred fat), coconut sugar and vanilla extract and beat for about 1 minute. Then add melted chocolate and cocoa powder and beat together for about 15 seconds, scraping down the sides of the bowl to help completely combined. Lastly, add the egg and beat once more for another 10 seconds until well mixed.
Add cassava flour 1/4 cup at a time and beat until combine. Then add baking soda and salt and beat once more for about 10 seconds. Then fold in chopped chocolate.
Place in fridge to cool for at least 15 minutes.
Use a cookie scoop to shape 14-15 cookies into round balls and place evenly throughout the baking sheet. Place in oven to bake for 12 minutes then let cool for 5 minutes before moving to a cooling rack and eating up!