Preheat the oven to 375°F (190°C).
In a medium bowl, whisk together the flour, baking soda, and salt.
In a large bowl, whisk together the melted butter, granulated and brown sugar, egg, milk and vanilla extract until smooth.
Add dry ingredients and mix the dough with a silicone spatula until just combined. Don’t over-mix the dough.
Fold in the chocolate chips.
Using a medium cookie scoop, shape the cookie dough into about 1-inch balls. Arrange the cookie balls on a baking sheet, lined with parchment paper, minimum 2 inches apart.
Bake the cookies for 10-12 minutes, or until cookies are nice and brown and flat.
Cool the cookies on the baking sheet for a few minutes, then transfer onto a cooling rack to cool completely.