Method

• 1.
  Preheat the oven to 190°C.
• 2.
  Line 2 large baking sheets with non-stick baking paper.
• 3.
  Place the butter and sugar in the bowl of an electric mixer and beat on high for 5 minutes until pale. Add the egg and vanilla and beat for a further minute. Sift the flour and bicarbonate of soda into the bowl. Add a pinch of salt, then use a wooden spoon to carefully fold in the flour until well combined. Fold in the chocolate chips. Roll 2 tablespoons of the mixture into a ball, then flatten slightly onto a baking tray lined with non-stick baking paper. Repeat, leaving a fair amount of space between each biscuit to allow for spreading. (You may need to bake the cookies in batches.) Bake for 15-20 minutes (the biscuits should have just started to darken at the edges but will still be a little soft). Remove from the oven and use a palette knife to lift biscuits from trays, then transfer to a wire rack to cool.