II
The Method
1
Beat the butter with the brown sugar and white sugar on medium speed until the mixture is pale, voluminous, and holds the impression of the beater — approximately 3–5 minutes. The air incorporated here provides the cookie's lift. The mixture is ready when it is noticeably lighter in both colour and texture than when it began.
2
Add the eggs one at a time, beating well after each addition, then beat in the vanilla. The mixture should be cohesive, glossy, and fully emulsified, with no visible streaks of egg.
3
Whisk together the flour, baking soda, and fine salt in a separate bowl. Add to the butter mixture and mix on low speed until just combined — no dry streaks remain, but the dough has not been overworked. Fold in the chocolate chips by hand.
4
Cover the dough and refrigerate for 24–36 hours. This cold rest hydrates the flour, firms the fat, and develops flavour through enzymatic activity. A dough baked fresh from mixing will spread flat and thin; a rested dough holds its shape and bakes thick. The dough is ready when it is firm enough to scoop cleanly without spreading on the sheet.
5
Heat the oven to 190 °C. Portion the dough into balls of approximately 40 g each and place on a parchment-lined baking sheet, spaced 5 cm apart. This is where the dish lives or dies: bake for 10–12 minutes, pulling the tray the moment the edges are set and golden but the centres still appear raw and underdone. The centre will continue to set on the hot tray as the cookie cools. A centre that looks fully baked in the oven will be dry and hard at the table.
6
Immediately scatter a small pinch of flaky sea salt over each cookie. Leave on the tray for 5 minutes — the retained heat finishes the centre — then transfer to a wire rack. The underside should be golden and release cleanly; the top surface should be set at the edges and still give slightly under light pressure at the centre.