In one bowl whisk together the flour, cornstarch, salt and baking powder.
In a separate bowl, use a mixer to beat together the butter and sugars. Do this on the lowest setting for about 2-5 minutes, or until the batter is lighter in color and fluffy. Drizzle in the milk and restart the mixer. Mix until the batter is creamy and blended.
Gradually add the dry ingredients, folding with a spatula. When no dry flour remains, pour in the chocolate chips and mix.
Preheat your oven to 400°F and chill the dough in your fridge while the oven preheats.
Scoop the dough into 8 even balls, weighing about 75 g each.
Evenly space out the dough on two parchment lined baking sheets.
Bake for 12-14 minutes at 400°F, or until the cookies have spread out and the edges appear slightly crisp.
After removing the cookies from the oven, tap or smack the tray on the counter a few times to increase the cookie's spread to create a thinner cookie. This will help with the texture.
Serve and enjoy. :)