Preheat the oven to 375°F and line 2 baking sheets with parchment paper, silicone mats or spray with non-stick spray. ( for best results only bake one pan at a time)
In a medium bowl, sift the flour, baking soda and salt together. Set aside.
In a large bowl, using an electric mixer or by hand, mix together the melted cooled butter, both sugars, and corn syrup until smooth and mixed together well.
Add the egg yolk, milk and vanilla and mix until fully incorporated and smooth, about one minute.
Slowly add the dry ingredients to the liquid ingredients, mixing until just combined.
Add the chocolate chips and mix until evenly distributed.
Using a cookie scoop ( #50) or a tablespoon roll into balls about 1.25 tbsp each. Place on prepared pans and bake ONE PAN AT A TIME in the middle shelf of preheated oven for 12 minutes. If your oven bakes unevenly, rotate cookies by turning the pan front to back halfway though baking.
ALlow cookies to cook on pans for about 3 minutes before transfering to cooking rack.