Preheat the oven to Fan 160*C / 180*C / 350*F / Gas Mark 4, and line a baking tray with some baking parchment

Place the butter into an ovenproof bowl, and place the bowl in the preheating oven, removing it when the butter has begun to melt slightly, (about 5 minutes should be fine).

In the meantime, mix the flour, salt and bicarbonate of soda together in a separate bowl, and set aside

Once the butter has cooled, add both the sugars and mix until light and fluffy

Add the egg to the butter mixture, mixing until just incorporated

Using your spoon, add the flour mixture to the butter mixture a little at a time and mix until just combined. It's done when the dough comes away from the sides of the bowl, and forms a ball

Gently stir in the chocolate chips until thoroughly mixed in

Place small drops of dough, about 1/2 tablespoon onto the baking tray, spacing apart allowing room to spread

Cook for 9 - 12 minutes until slightly golden brown. If you prefer a softer cookie, then remove them from the oven earlier, and if you prefer a crunchier cookie, then allow them to turn golden brown before removing. They may come out still soft, but will harden whilst cooling

Place the cookies onto a cooling rack and allow to cool (but I prefer to eat them warm!)