Preheat the Oven: Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper or a silicone baking mat.
Mix Dry Ingredients: In a medium bowl, whisk together the flour, baking soda, and salt. Set aside.
Cream the Butter and Sugars: In a large bowl, cream the softened butter, granulated sugar, and brown sugar together using an electric mixer or hand whisk until the mixture is light and fluffy.
Add the Egg and Vanilla: Beat in the egg and vanilla extract until well combined.
Combine Wet and Dry Ingredients: Gradually add the dry ingredients to the wet mixture, mixing until just combined.
Stir in the Chocolate Chips and Pecans: Fold in the chocolate chips and chopped pecans, mixing until evenly distributed throughout the dough.
Scoop and Bake: Use a cookie scoop or tablespoon to drop cookie dough onto the prepared baking sheet, spacing the cookies about 2 inches apart.
Bake: Bake for 10-12 minutes, or until the edges are golden and the centers are set.
Cool: Allow the cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.