01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together flour, baking soda, and salt. Set aside.
03 - In a large bowl, whisk melted butter, granulated sugar, and brown sugar until smooth and glossy.
04 - Beat in the egg and vanilla extract until fully combined.
05 - Gradually stir in the dry ingredients until just incorporated, taking care not to overmix.
06 - Fold in chocolate chips or nuts, if using.
07 - Scoop heaping tablespoons of dough onto the prepared sheets, leaving at least 2 inches between each.
08 - Bake for 10 to 12 minutes until edges turn golden brown and crisp while centers remain set.
09 - Allow cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.