Add the egg and egg yolk, and mix again until the mixture is smooth and fully blended.
Add the flour and baking soda, and mix until the dough is almost combined.
Add the chocolate chips and gently fold them in until just combined—avoid overmixing to keep the cookies soft and chewy.
Cover the bowl with plastic wrap and let the dough rest in the fridge for at least 30 minutes. For even better flavor and texture, chill the dough overnight.
Use a cookie scoop (about 1½ tablespoons of dough) to portion the cookies.
Place the dough balls on a parchment-lined baking sheet, top with extra chocolate chips, and bake in a preheated 180°C (350°F) oven for 9–11 minutes, or until the edges are set but the centers still look soft.
Let the cookies cool on the baking sheet for 5 minutes, then transfer them to a wire rack to cool completely.
Finish by sprinkling each cookie with a pinch of flaky salt and serve with a glass of milk for the best experience!
Notes
Use room-temperature eggs. They mix more smoothly into the dough and help create the perfect chewy texture.
Measure the flour correctly. Too much flour makes cookies dry. Use a kitchen scale or the spoon-and-level method for accuracy.
Mix the dough gently. After adding the flour, mix only until combined to keep the cookies soft and tender.
Use a cookie scoop. This ensures evenly sized cookies that bake consistently every time.
Chill the dough. Even 30 minutes helps the cookies hold their shape, develop flavor, and bake more evenly.
Use good-quality chocolate. Chocolate chunks from a chopped bar melt into bigger pools than chips and make the cookies extra decadent.
Don’t overbake. Pull the cookies out when the edges are set, but the centers still look soft. They’ll firm up as they cool.
Add extra chocolate on top. Press more chocolate chips or chunks onto each cookie while warm for a bakery-style finish.
Use flaky salt. A pinch of flaky salt on top brings out the chocolate flavor and adds a delicious contrast.
Cool on the tray first. Let the cookies rest on the baking sheet for a few minutes before moving them. This helps them set without overbaking.