In a bowl, mix the egg replacer powder with 6 tbsp water, whisk well and keep it aside.
Take the butter in a bowl and beat it along with sugars till creamy.
Then add the Nutella, continue beating till well blended.
Next add the egg replacer, salt, vanilla essence and blend again.
Add the cocoa powder, flour in batches and mix well. By this time, you will have to mix with your hands.
So add in the chocolate chips and combine everything until well mixed.
Chill the batter for 10 to 15 mins
Preheat the oven at 185C, scoop out small balls of batter, flatten well on a lined baking tray.
Bake for 12 to 15 mins.
Allow to cool before enjoying!