1In a saucepan, melt 1/4 cup or 280 grams of unsalted butter. Set aside to cool.
2Roughly chop 1 pound or 450 grams of dark chocolate.
3In a medium bowl, combine 1 1/2 cups or 230 grams of cake flour, 2 cups or 275 grams of all-purpose flour, 1 1/2 teaspoons or 5 grams of kosher salt, 2 teaspoons or 8 grams of cornstarch, and 1/2 teaspoon or 6 grams of baking soda. Whisk together.
4In a stand mixer fitted with the whisk attachment, combine 1 1/4 cups or 285 grams of light brown sugar and 1/2 cup or 115 grams of white granulated sugar.
5Slowly stream in the cooled melted butter and mix until creamy.
6Add 2 eggs, one at a time, followed by 3 egg yolks, mixing well after each addition.
7Switch to the paddle attachment and mix in the flour mixture.
8Fold in 2 cups or 165 grams of roughly chopped walnuts and the chopped chocolate.
9Chill the dough for at least 45 minutes. The longer you chill, the taller the cookies will be.
10Scoop 6-ounce balls of dough using a 4 oz stainless steel disher and place them on a baking sheet lined with parchment paper, allowing extra room between cookies. For extra tall cookies, chill the dough balls for an additional 25 minutes.
11Bake at 425°F or 220°C for 10-13 minutes until lightly browned on the outside and slightly underdone on the inside.
Ingredients
0.25 cup unsalted butter
1 pound dark chocolate (60-70% cacao)
1.5 cups cake flour
2 cups all-purpose flour
1.5 teaspoons kosher salt
2 teaspoons corn starch
0.5 teaspoon baking soda
1.25 cups light brown sugar
0.5 cup white granulated sugar
2 eggs
3 egg yolks
2 cups roughly chopped walnuts
Equipment
ovenwhiskstand mixer with whisk attachmentpaddle attachment6 oz ice cream scoopfood scalebaking sheetparchment paper