In a microwave safe bowl, melt your margarine.

With an electric whisk, whisk in the sugars, vanilla and salt until thick.

Whisk in the egg until slightly paler and well combined.

Whisk in the flour, stopping when the mixture is well combined. The mixture should be quite supple.  

Fold in the chocolate chips.

Place in the fridge for a minimum of 30 minutes, an hour is best, to firm up the dough.

Once the dough is firmer, evenly spoon teaspoons (or small icecream scoops) of dough onto a lined baking tray. Press extra chocolate chips on top of the balls of dough.

Bake at 170C for 11 minutes exactly. The cookies will be very pliable when they first come out of the oven, Leave them to cool and set on the baking tray for at least 10 minutes.