Brown the butter

1. In a saucepan, melt butter over medium heat. Continue cooking, stirring frequently, until butter turns golden brown and smells nutty, about 5 minutes.
2. Transfer browned butter to a large bowl and let cool for 10 minutes.

Make the dough

1. Add brown sugar and granulated sugar to the cooled butter. Whisk until combined.
2. Add eggs and vanilla extract, whisking until smooth.
3. In a separate bowl, whisk together all-purpose flour, baking soda, and salt.
4. Fold dry ingredients into wet ingredients until just combined. Fold in chocolate chips.

Bake

1. Preheat oven to 375°F (190°C). Line baking sheets with parchment paper.
2. Scoop dough into 2 tablespoon-sized balls and place on prepared baking sheets, spacing them 3 inches apart.
3. Bake for 11-13 minutes until edges are golden brown but centers still look slightly underdone.
4. Let cool on baking sheet for 5 minutes, then transfer to a wire rack.
5. Sprinkle with extra flaky sea salt while still warm, if desired.