Note: This cookie dough needs to be chilled.
In a skillet, toast the pecans for about 4-5 minutes on medium heat, stirring frequently until the pecans are lightly toasted and begin to become fragrant. Set them aside to cool. (Make sure they are cooled or they will melt the chocolate chips in the dough.)
Whisk together the flour, sea salt, baking soda and corn starch. Set aside. Using an electric mixer, beat together the melted butter and sugars until smooth. Add in the eggs and vanilla and beat until fully incorporated. (You can use a whisk for this part but I prefer the mixer.)
Slowly beat in the flour mixture. Don't over mix. Just mix until the flour is incorporated. You can use a hand mixer or spoon for this part. Then fold in the chocolate chips and chopped pecans.
Chill the cookie dough for at least 2 hours and up to about 2 days. For ease in forming the cookies, chill the dough for about 30 minutes and then use a 1½ tablespoon cookie scoop and roll into balls. Arrange on a parchment lined dish or container and chill for the remaining time.
Once chilled, preheat the oven to 350°F. Allow the cookie dough to sit out for about 5-10 minutes to slightly soften before arranging 2 inches apart on a parchment lined cookie sheet. Bake for about 9-12 minutes or until the edges become golden. The top may look undercooked, but they will still set. Better to under cook than over cool.
Allow the cookies to cool for 3-4 minutes before transferring to a cooling rack to fully cool. Store for about 4-5 days in an air tight container at room temperature.