BowerStudios.com

From Joshua Weissman's Youtube Channel
Here's the recipe in case anyone wants to follow at home:

16oz (450g) Dark Chocolate (60-70%)
1 ¼ Cup (280g) Unsalted Butter
230g Cake Flour
275g All Purpose Flour
5g Kosher Salt
8g Corn Starch
6g Baking Soda
285g Brown Sugar
115g White Sugar
5 Eggs
165g Chopped Walnuts (optional)

1. Melt butter in a sauce pan and let it cool
2. Whisk together both flours, salt, corn starch, and baking soda in a medium sized bowl
3. In a stand mixer with the whisk attachment, combine both sugars on medium speed
4. Slowly stream in the butter until mixture is creamy
5. Add 2 eggs then 3 egg yolks, one at a time until each is incorporated
6. Switch to paddle attachment then mix in dry ingredient mixture
7. Combine chocolate and walnuts (optional) using a rubber spatula
8. Put cookie dough in a bowl, cover, and let rest in fridge for at least 45 minutes
9. Divide into 6oz balls and arrange onto baking sheets
10. Refrigerate baking sheets with cookie dough's for 25 minutes
11. Bake at 425 degrees Fahrenheit or 220 degrees Celsius for 10-13 minutes, or until brown on the outside. The inside will be soft and chewy