Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper.

In a large mixing bowl, cream together the butter, granulated sugar, and light brown sugar until light and fluffy.

Mix in the egg and vanilla extract until well combined.

Gradually stir in the flour, baking soda, and salt until just combined.

Fold in the oats, chocolate chips, and chopped pecans until evenly distributed.

Using a cookie scoop, drop rounded balls of dough onto the prepared baking sheet, spaced about 3 inches apart.

Bake for 8-9 minutes until the edges are golden brown but the centers are still soft.

Optional: Sprinkle extra pecans on top after baking for added crunch.

Cool on the baking sheet for 10-15 minutes before transferring to a wire rack.