Place 1 cup of unsalted butter in a medium saucepan over medium heat. Stir constantly as the butter melts and then begins to foam. Watch carefully as the color changes from yellow to golden brown and you notice a rich, nutty aroma. This should take about 5 minutes. Once browned, immediately transfer the butter to a heatproof bowl to cool slightly.
Add 1 cup brown sugar and 1/2 cup granulated sugar to the browned butter. Stir until the mixture is smooth and well combined.
Beat in 2 large eggs, one at a time, stirring well after each addition. Then add 2 teaspoons of vanilla extract.
In a separate bowl, whisk together 2 1/4 cups all-purpose flour, 1 teaspoon baking soda, and 1/2 teaspoon salt.
Gradually add the dry ingredients to the wet brown butter mixture, stirring gently until just combined. Avoid overmixing to keep your cookies tender and chewy.
Gently fold in 2 cups of chocolate chips.
For best texture and flavor, refrigerate the dough for at least 30 minutes (optional but recommended).
Preheat your oven to 350°F (175°C). Line baking sheets with parchment paper or silicone mats. Using a cookie scoop or tablespoon, drop dough balls about 2 inches apart. Bake for 10-12 minutes, until edges are golden and centers look set but soft.
Let cookies cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.