01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together flour, baking soda, and salt until well blended.
03 - In a large bowl, beat unsalted butter, tahini, light brown sugar, and granulated sugar with a mixer until creamy and smooth, about 2 minutes.
04 - Add the egg and vanilla extract to the wet mixture and mix until fully combined.
05 - Gradually mix the dry ingredients into the wet mixture until just combined, avoiding overmixing.
06 - Stir in the semisweet chocolate chips by hand until evenly distributed.
07 - Scoop tablespoon-sized balls of dough onto the prepared baking sheets, spacing them about 2 inches apart.
08 - Lightly sprinkle flaky sea salt over each cookie ball if desired.
09 - Bake in the preheated oven for 10 to 12 minutes, until the edges turn lightly golden and the centers remain slightly underbaked.
10 - Cool cookies on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.