Brown Butter and cool to room temp (but still liquid). Include all of those brown bits at the bottom of the pan-this is where the flavor is!
While the butter is cooling, whisk together the flour and other dry ingredients into a medium bowl.
Cream butter & sugars for 2 minutes on medium speed (2)
Add egg, yolk, vanilla, and milk and mix for 1 minute or until incorporated.
Add the dry ingredients to the bowl and mix slowly.
Add in chocolate chips
Cover & Chill
When dough is firm and cool througout, roll into balls then press into the sides to make a cylinder shape-you're aiming to have the ball taller than wide
Bake 6-8 cookies per sheet, 2 inches apart
Bake for 9 minutes at 350 degrees
Remove cookies from oven. Sprinkle with sea salt (if desired) and press a few more chocolate chips into the top (this is for aesthetics only, the cookies are packed with chips already!)
Cookies will look slightly under-baked, this is okay! They will continue to bake on the cookie sheet after removed from the oven. If you bake them until they look done, they will be crunchy instead of soft and chewy.