INGREDIENTS
10 tbsp
unsalted butter
4 oz
bittersweet chocolate, chopped
1 cup
granulated sugar
1/3 cup
packed light brown sugar
2/3 cup
unsweetened cocoa powder, sifted
1/2 tsp
vanilla extract
2
large eggs plus 1 egg yolk
2/3 cup
all-purpose flour
1 tbsp
cornstarch
1/4 tsp
salt
3/4 cup
chopped California walnuts