Preheat oven to 325* and line a large baking sheet with parchment paper.
Beat both sugars and softened butter until incorporated
Beat egg and egg yolk together, add vanilla, and combine with sugar and butter mixture until smooth (add milk if needed)
In a separate bowl, sift flour and stir in baking soda and cinnamon
Add dry ingredients to wet. Mix together until fully incorporated
Stir in chocolate chips
Roll dough into 1/2” balls and place on parchment paper lined cookie sheet 1” apart. Sprinkle with salt.
Bake at 325* for 10 minutes