Preheat the oven to 350°F. Line two baking sheets with parchment paper and set aside.
In a medium-sized mixing bowl, whisk the flour*, salt, baking soda, and cornstarch.
In a large mixing bowl, add the butter, brown sugar, and granulated sugar. Beat until light and fluffy, 1-2 minutes. Add the milk and vanilla and beat until smooth and creamy.
Add about half of the flour mixture to the wet mixture and use a rubber scraper to mix until just combined. Add the rest and mix until just combined.
Fold in the chocolate chips.
Using a cookie scooper, place ~1.5 tbsp (22 g) balls of dough on the prepared baking sheets (you can also make them using a larger cookie scoop - see below for updated baking time).
Bake in the preheated oven for 9-11 minutes, until they are slightly golden brown (larger cookies should be baked for 11-13 minutes). They may look slightly underbaked, but will bake more while cooling - don't overbake them.
Allow to cool on the baking sheets then enjoy!