INGREDIENTS
6
Eggs, large
2 1/4 cups
white sugar
1
vanilla extract (about 1 tablespoon
1/4 cup
light brown sugar, light
1 cup
all-purpose flour
1 1/3 cups
dutch process cocoa powder, Dutch process
1 cup
finely chopped dark chocolate
1 3/4 tsp
Diamond crystal kosher salt
1 tsp
Espresso, instant powder
3 sticks
unsalted butter, unsalted