Start by mixing the flour, baking soda, and salt in a bowl and set it aside. Next, cream the softened butter, brown sugar, and granulated sugar for 2 minutes on medium speed. Once they are mixed together, add the vanilla, milk, and eggs. Mix only until they are combined. As noted above, you do not want to overmix once the eggs are added.
To this, add in the flour mixture and again, mix to combine. The batter will be stiff, and that is just what you are looking for.
Last in are the chocolate chips. Mix these only to combine as well.
The cookies can be baked right away, but I prefer to chill them first. Let the dough chill for at least 1 hour, or up to 12 hours in the fridge. Preheat the oven to 350 degrees.
Scoop onto your parchment-lined baking sheet. Bake for 12-14 minutes. These cookies are best if they are underbaked just slightly.
Remove them from the oven and continue to bake the rest of the batch in the same manner.