Melt the butter in a saucepan over medium-low heat, stirring frequently until it turns golden brown with a nutty aroma (about 5–7 minutes). Let it cool slightly.

In a bowl, mix the browned butter with brown sugar and granulated sugar.

Add the egg, egg yolk, and vanilla extract. Mix until smooth.

Fold in flour, baking soda, and salt until just combined.

Gently fold in chocolate chips.

Cover and chill the dough for at least 1 hour.

Preheat oven to 350°F (175°C) and line baking sheets.

Scoop dough portions and place them 2 inches apart.

Bake for 12–13 minutes until edges are golden and centers are soft.

Sprinkle with flaky salt and cool slightly before serving.

These Chocolate Chip Cookies develop deeper flavor thanks to the chilling step and browned butter technique.