whip butter, caster sugar, brown sugar and the egg in a medium bowl until fluffy.
add in flour, salt, vanilla extract and the chocolate chunks and stir with a wooden spoon until well combined. ensure the chocolate chunks are spread out well in the dough
roll out 18 cookie dough balls and place on lined baking tray. cook in oven for 10 mins
take out of oven and allow to cool for 10 mins before eating.