Preheat your oven to 350°F (175°C).

In a large mixing bowl, cream together the butter, granulated sugar, brown sugar, and vanilla extract.

Sift together the all-purpose flour and salt in a separate bowl, then gradually add this dry mixture to the creamed butter and sugar.

Roll small balls of dough, about 1 inch in diameter, and place them on prepared baking sheets, leaving enough space for spreading.

Flatten each dough ball slightly with a fork or fingertips and sprinkle with flaky sea salt.

Bake for 12 to 15 minutes until golden brown at the edges but slightly pale in the center.

Let cookies cool on the baking sheet for about 5 minutes before transferring to a wire rack.