Preheat oven to 325°F; line baking sheets with parchment.

Whisk flour, baking soda, and salt in a bowl; set aside.

Whisk melted butter and both sugars in a large bowl until smooth and well combined.

Vigorously whisk in whole egg, yolk, and vanilla until glossy and smooth.

Add flour mixture all at once; stir with a wooden spoon or spatula just until combined.

Fold chocolate chips evenly into thick dough.

Scoop rounded tablespoon-sized balls onto prepared sheets, 2 inches apart.

Bake 9-11 minutes, until edges just set but centers are very soft and slightly underbaked.

Rest on sheet 5 full minutes without moving.

Transfer to wire rack to cool completely and set chewy.