INGREDIENTS
6
Eggs, large
1 cup
All-purpose flour
1/2 cup
Brown sugar, dark packed
3/4 cup
Cocoa powder, unsweetened Dutch process
2 cups
Granulated sugar
2 tsp
Kosher salt
1
Sea salt, Flaky
8 oz
Semisweet or bittersweet chocolate, good-quality
2 tsp
Vanilla extract
1 tbsp
Espresso, powder
2 1/2 sticks
Butter, unsalted