For a rich golden-brown butter, heat it in a pan with a light-colored surface over medium-high heat. Allow the butter to come to a boil, and stir it occasionally until the solids at the bottom turn a beautiful golden brown color. Be careful near the end as it can burn quickly. Once done, pour into a large mixing bowl to halt the cooking process and let cool for 10 minutes.
In a bowl, mix the flour, cornstarch, baking soda, and salt, using a whisk
Mix the cooled browned butter with the sugars using a whisk. Next, incorporate the vanilla and eggs into the mixture and continue whisking until everything is thoroughly blended
Gradually add the dry ingredients to the bowl and stir until the mixture is evenly blended and no flour streaks are visible.
Mix in the buttered pecans.
Wrap the dough with plastic wrap, making sure it touches the surface. Refrigerate for a minimum of 3 hours, or for up to 3 days. If the dough has been chilled for more than 3 hours, allow it to come to room temperature for 30 minutes before scooping to make it easier to handle.