Best Chocolate Chip Cookies

1. Beat butter and both sugars until creamy. Beat in egg, yolk, and vanilla.
2. Whisk flour, baking soda, and salt in a second bowl; mix into the butter mixture just until combined.
3. Fold in chocolate chips. Chill dough 20 minutes while the oven heats to 180°C / 350°F.
4. Scoop onto lined trays with space between each. Bake 10–12 minutes until edges are golden and centres look soft.
5. Top with flaky salt and cool on the tray 10 minutes before moving to a rack.

Tips & Variations

• For thicker cookies, chill the dough for 1–2 hours.
• Bake one test cookie first to check spread in your oven.
• Freeze portioned dough balls for up to 2 months; bake from frozen with 2–3 extra minutes.