Preheat oven to 175°C / 350° F.
In a bowl using a hand mixer, mix together avocado and coconut sugar until smooth. Add in the egg.
Mix in the cocoa powder and baking soda - or better: blend everything together in a food processor, so easy.
Stir in chocolate chunks.
Using two spoons place dollops of cookie dough in a baking sheet with parchment paper. The cookie won't spread as much as usual cookies when baking, so make sure to flatten them out a bit with the back of the spoon.
Bake for 8-10 minutes or until the cookies don't stick as much to the paper as they did before baking.
Cool down. Store in an airtight container in the fridge.