INGREDIENTS
1 1/4 cups
All-purpose flour
1/2 tsp
Baking soda
5 oz
Bittersweet chocolate
2/3 cup
Brown sugar, packed light
1/3 cup
Cocoa powder
1/2 tsp
Fleur de sel
1/4 cup
Sugar
1 tsp
Vanilla extract, pure
1 stick plus 3 tablespoons (11 tablespoons; 5 1/2 ounces) unsalted butter, at room temperature