Add the chocolate and low fat butter to a microwave safe bowl and microwave in 20 second spurts until completely melted and smooth, whisking every 20 seconds. Set aside.
In a medium bowl, whisk together the egg, 0 calorie brown sugar and 0 calorie granulated sugar. Whisk until the egg is light and fluffy, about 3 minutes.
Whisk in the melted chocolate and butter mixture until well combined. Fold in the flour, cocoa powder and salt until well combined. The batter will be a little runny but should still be scoop-able.
Scoop 6 equal balls of dough and place onto a baking tray lined with parchment paper. Ensure you don't position the cookie balls too close to one another so they don't spread out into each other.
Bake for 8 minutes and allow them to cool on the baking tray for a few minutes before tucking in!