• Preheat the oven to 190ºc / Gas 5 and line 2 baking trays with baking paper.
• In a large mixing bowl, with an electric whisk mix together the butter and both sugars until smooth and creamy.
• Gradually add the eggs to the butter until all combined.  Then mix in the vanilla extract and stir.
• In a separate bowl, combine the flour and bicarbonate of soda.
• Gradually add the flour to the egg mixture and beat well.  Once all combined add the chocolate chips.  Top tip: if you find the mixture is very soft, cover and chill in the fridge for 30mins.
• You will need to bake these in a few batches. Drop a teaspoon of dough onto the trays, spacing well apart as they will spread and bake in the oven for 10 - 12mins until golden at the edges.  Cool for 5mins, then transfer to a wire rack to cool completely.

Top tip:

• As you're cooking in batches, if the oven is getting too hot, turn down by 10° to 180°c or reduce the cooking time to 8-9mins.