In a small bowl, whisk together the flour, baking soda, and salt. Set aside.
In a large bowl, beat the softened butter with both sugars until light and fluffy, about 2 minutes.
Mix in the egg yolk and vanilla extract until well combined.
Gradually stir in the flour mixture until just incorporated — don't overmix!
Fold in the chocolate chips.
Scoop dough into 1.5-tablespoon balls and place them on a parchment-lined air fryer basket, leaving at least 2 inches between each cookie.
Air fry at 325°F for 8–10 minutes, until the edges are golden and the centers look just slightly underdone.
Let cookies cool in the basket for 5 minutes before transferring — they firm up as they cool!