Melt butter in a small saucepan over medium-high heat. Cook and stir for about 3 minutes until golden specks form in butter it begins to smell nutty. Remove browned butter from heat and pour into a heatproof bowl. Refrigerate brown butter for 20-30 minutes to cool slightly.
1 cup salted butter
Preheat oven to 375°F. Line 2 large baking sheets with parchment paper or silicone baking mats. Set aside.
Transfer browned butter to the bowl of a stand mixer and add the dark brown sugar and granulated sugar. Beat for 1 minute on high speed to combine.
1 cup (200g) dark brown sugar, 1/2 cup (100g) granulated sugar
Add eggs and vanilla extract and beat again.
2 large eggs, 2 teaspoons vanilla extract
Add flour, baking soda, and salt. Mix to combine, scraping sides and bottom of bowl as needed.
2 1/3 cups (329g) all-purpose flour, 1 teaspoon baking soda, 1 teaspoon salt
Add chocolate chips and chopped pecans, mixing just until evenly distributed.
1 1/2 cups semisweet chocolate chips, 1 1/2 cups roughly chopped pecans
Use a 2-tablespoon cookie scoop to scoop even amounts of dough onto prepared baking sheets. Roll dough into balls between your hands. Space each ball of dough a few inches apart on the baking sheet. Press additional chocolate chips and pecan pieces into tops of each cookie, if desired.
Bake for 9-10 minutes until edges are just set and centers are still soft. Remove from oven. Let cool on cookie sheet for 2 minutes. Remove to wire rack to cool completely.