Preheat your oven to 350°F (175°C) and line baking sheets with parchment paper.
In a large mixing bowl, cream the softened butter, brown sugar, and granulated sugar together until light and fluffy using an electric mixer or whisk.
Add the vanilla pudding mix and mix until well combined.
Beat in the eggs one at a time, followed by the vanilla extract, until smooth.
In another bowl, whisk together the all-purpose flour, baking soda, and salt.
Gradually add the dry ingredients to the wet mixture, mixing until just combined.
Fold in the chocolate chunks and chopped pecans until evenly distributed.
Using a cookie scoop or spoon, drop rounded tablespoons of dough onto the prepared baking sheets, leaving space between each cookie.
Bake in the preheated oven for 10-12 minutes, or until the edges are lightly golden and the centers are set.
Remove from the oven and let cool on the baking sheets for 5 minutes before transferring to a wire rack to cool completely.