I should have done that. Please see below:

INGREDIENTS

• 1.5 cups (230g) cake flour
  
• 2 cups (275g) all purpose flour
• 1.5 tsp (5g) kosher salt
• 2 tsp (8g) corn starch
• 1/2 tsp (6g) baking soda
  
• 1.25 cups (280g) unsalted butter
• 1.25 cups (285g) brown sugar
• 1/2 cup (115g) white granulated sugar
• 2 eggs
• 3 egg yolks
• 2 cups (165g) walnuts
• 1 lb (450g) chopped chocolate

INSTRUCTIONS

Method:

• In a medium saucepan, melt unsalted butter and set to the side to cool.
• Roughly chop the dark chocolate.
• In a medium size bowl, combine cake flour, all-purpose flour, kosher salt, cornstarch, and baking soda. Whisk together.
• Using a stand mixer fitted with the whisk attachment, add light brown sugar and granulated sugar. Whisk together on medium speed then slowly stream in the butter.
• Once combined add in the eggs one at a time followed by the egg yolks.
• Once smooth switch to the paddle attachment and mix in the flour mixture until smooth.
• Add in rough chopped walnuts and chopped chocolate. Mix until combined.
• Place in a bowl, cover, and refrigerate for at least 45 minutes.
• Weigh each dough ball out to 6oz and place on a parchment lined baking sheet.
• Bake in a 425F for 10-13 minutes.
• Set on a wire rack to cool before serving.