INGREDIENTS
1
Egg plus 1 egg yolk, whole
10 3/8 oz
(1 3/8 cup, packed) brown sugar, packed
2 tsp
Baking powder
9 oz
Bittersweet chocolate
1
Bittersweet chocolate
5/8 tsp
Salt
1
Vanilla bean
2 tsp
Vanilla extract
6 oz
Butter, unsalted
9 1/2 ounces (2 1/4 cups, spoon and level) all-purpose flour