Preheat the oven to 190°C and line a baking tray with baking paper.
Using an electric mixer, beat the butter, sugars et vanilla until pale and fluffy (roughly 5 minutes). Add the eggs and mix until combined. Sift in the flour and baking soda, then add the salt and mix until just combined. Finally, stir in the chocolate chips.
Roll the mixture into golf ball-sized balls and place onto the baking tray ensuring to leave at least a 2-inch gap between each ball (you may need to bake them in several rounds if you have a small oven).
Bake for 12 minutes. They will still be soft when you remove them from the oven but they will become firmer as they cool. It’s best to wait 10 minutes before trying to move them.