INGREDIENTS
2 cups
unbleached all-purpose flour
1/2 cup
natural cocoa powder
1/2 tsp
baking soda
1/2 tsp
salt
12 tbsp
unsalted butter, (melted and cooled slightly)
1 cup
light brown sugar (packed)
1/2 cup
granulated sugar
1/4 tsp
espresso powder, (optional)
1
large egg plus 1 egg yolk
2 tsp
vanilla extract
1 12 ounce package
semi-sweet chocolate chips
1 cup
chopped walnuts