In a bowl mix flour baking soda and salt. In a second bowl combine well the butter, brown sugar, egg yolk and the vanilla extract. Add the dry ingredients and the chocolate chips to the butter mix.
Turn the grill on. Select the manual mode and select yellow color setting. When OptiGrill is ready to cook drop by spoon into the bottom of the oven accessory. Close the lid. Cook them during 12 minutes. Flip out them at mid cooking.
When they are cooked, transfers to racks and let cool down.