Start by placing the two sticks of unsalted butter in a saucepan over medium heat. Allow it to melt, stirring frequently. Once it reaches a nutty aroma and has a deep amber color, remove it from the heat and let it cool slightly.
In a mixing bowl, whisk together the all-purpose flour, baking soda, and flaky sea salt.
In another large bowl, combine the browned butter, dark brown sugar, and granulated sugar. Beat them together until creamy. Add in the vanilla extract and eggs, mixing until fully combined.
Gradually add the dry ingredients into the wet mixture, mixing on low speed until just combined. Be careful not to overmix.
Fold in the mini chocolate chips using a spatula, ensuring they are evenly distributed throughout the dough.
Cover the dough and chill it in the refrigerator for at least 30 minutes.
Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
Once the dough has chilled, portion out the dough onto the prepared baking sheet, leaving enough space between each cookie. Bake for 10-12 minutes or until the edges are golden brown.
Allow the cookies to cool on the baking sheet for about 5 minutes before transferring them to a cooling rack.