Preheat the oven to 350 degrees
Add cold butter, brown sugar and granulated sugar to stand mixer
Mix on medium to high speed for 4-5 mins
Add in the eggs and vanilla, mix until incorporated
Add in flour, salt, baking soda and corn starch, mix well
Dough will be very thick.
Pour in milk chocolate chips and stir in with a wooden spoon or rubber spatula
Using a large cookie scooper, scoop evenly sized balls of dough. Roll the dough in the mini chip and space out on the parchment lined baking sheets.
Bake in a 350 degree oven for 20 mins or until golden brown
Allow to cool 5-10 mins before serving.