Preheat your oven to 350°F (175°C).
In a large mixing bowl, combine the butter, brown sugar, and sugar. Cream until light and fluffy, about 3-5 minutes.
Add the lightly beaten egg and vanilla, mixing until well combined.
Gradually add the all-purpose flour, stirring gently until just combined.
Fold in the chopped pecans gently.
Drop spoonfuls of dough onto a baking sheet lined with parchment paper. Bake for 10-12 minutes.
Allow cookies to cool on the baking sheet for a few minutes before transferring to a cooling rack. Dust with powdered sugar before serving.
