Prepare the pecans: In a skillet over medium heat, toast the pecans for about 5-6 minutes, stirring occasionally, until they are fragrant and lightly golden. Remove from heat, let cool, and coarsely chop. Set aside.
Prepare the wet mixture: In a large bowl, combine the melted butter, the egg, additional yolk, vanilla extract, with the granulated and brown sugars. Stir until well incorporated.
Add the dry ingredients: Add the flour, baking soda, and salt to the wet mixture. Stir just until no dry spots remain, being careful not to overmix.
Add the nuts and chocolate: Fold in the chocolate chips and chopped pecans, ensuring they are evenly distributed.
Chill the dough: Refrigerate the dough for at least 3 hours until firm. This step helps enhance flavor and prevents the cookies from spreading too much during baking.
Form the cookies: Use a #20 cookie scoop (about golf-ball size) to shape dough balls, placing them on a baking sheet lined with parchment paper. Leave space between each.
Bake: Preheat the oven to 350°F (175°C). Bake the cookies for 12-14 minutes, until the edges are golden, and the centers are still slightly soft. Remove from the oven and let cool on the tray for a few minutes before transferring to a wire rack to cool completely.
Garnish (optional): Sprinkle a pinch of flaky sea salt on the cookies while they’re still warm to enhance the flavor.