Preheat your oven to 350°F (175°C).

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

Gradually sift in the all-purpose flour and salt, mixing until just combined.

Scoop out portions of dough and roll into balls, then flatten slightly and sprinkle with flaky sea salt.

Bake for 12-15 minutes or until the edges turn lightly golden.

Cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.