Method: First, preheat the oven to 180ºC. Grease 2 or 3 baking trays. Next, mix the flour, the baking soda and the salt. After that, add the flour mixture. Add the chocolate chips. Later,mix the butter and the brown sugar. Add the eggs and the vanilla. Finally,put the mixture on the baking tray with a spoon. Bake for 8 to 10 minutes.