Whisk flour, baking soda, and salt in a medium bowl; set aside.
Beat butter and both sugars in a large bowl about 3-4 minutes, until light and fluffy.
Beat in eggs one at a time, beating well after each; mix in vanilla.
Gradually mix flour mixture into butter mixture just until combined; fold in chocolate chips.
Cover; refrigerate at least 2 hours or overnight.
Preheat oven to 375°F; line baking sheets with parchment.
Scoop 1/4 cup portions onto prepared sheets, 3 inches apart.
Bake 12-14 minutes, until edges are golden and centers look slightly underdone.
Immediately sprinkle with flaky salt; cool on sheet 5 minutes, then transfer to wire rack.