Brown the butter by melting it in a saucepan over medium heat, stirring frequently until golden brown and nutty in aroma. Let it cool slightly.

In a large bowl, combine the brown sugar and granulated sugar with the brown butter. Mix until creamy. Add the egg and vanilla extract, and beat until well combined.

In a separate bowl, whisk together the flour, baking soda, and salt. Gradually fold this dry mixture into the butter mixture until just combined.

Fold in the chopped pecans.

Cover the dough and refrigerate for at least 30 minutes.

Preheat your oven to 350°F (175°C). Scoop tablespoon-sized balls of dough onto a parchment-lined baking sheet. Optionally, sprinkle a pinch of sea salt on top before baking.

Bake for 10-12 minutes until edges are golden brown and centers are soft.

Once out of the oven, let them cool for a few minutes before transferring them to a wire rack.