Preheat your oven to 350°F (175°C).
In a large mixing bowl, cream together the softened butter, brown sugar, and white sugar until light and fluffy.
Add the vanilla extract and the large egg, continuing to mix until well combined.
In a separate bowl, whisk together the flour, cornstarch, and baking soda. Gradually add this dry mixture to the wet ingredients, stirring until a soft dough forms.
Gently fold in the chopped pecans and caramel baking bits, distributing them evenly throughout the dough.
Using a tablespoon or cookie scoop, drop rounded portions of dough onto a lined baking sheet, leaving enough space between each cookie for spreading.
Bake for 12 to 14 minutes or until the edges are golden brown. The centers may appear slightly undercooked but will firm up as they cool.
Once baked, remove the cookies from the oven and allow them to cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.