Step 1

Heat oven to 375°F and place the racks in the top third and bottom third of the oven. Line 4 half-sheet pans with parchment paper and set aside.

Step 2

Melt the butter in a 2-quart saucepan over low heat. Set aside to cool slightly.

Step 3

Sift together the flour, salt, and baking soda onto a paper plate.

Step 4

Pour the butter into the bowl of your stand mixer. Add the sugars and beat with the paddle attachment on medium speed for 2 minutes.

Step 5

Meanwhile in a separate bowl, whisk together the whole egg, egg yolk, milk, and vanilla extract.

Step 6

Slow the mixer to “stir” and slowly work the egg mixture into the butter and sugar. Mix until thoroughly combined, about 30 seconds.

Step 7

Using the paper plate as a slide, gradually integrate the dry ingredients, stopping a few times to scrape down the side of the bowl with a rubber spatula. Once the flour is worked in, add the chocolate chipsI'd suggest chopping your own dark chocolate chunks in the 68% cocoa range.. Chill the dough for 1 hour.

Step 8

Scoop the dough into 1 1/2-ounce portions and place on the half-sheet pans, 6 cookies per sheet.

Step 9

Bake two sheets at a time for 15 minutes, rotating pans halfway through baking.

Step 10

Remove from the oven, slide the parchment with the cookies onto a cooling rack, and wait at least 5 minutes before devouring.