INGREDIENTS
1 cup
butter, at room temperature
3/4 cup
dark-brown sugar
3/4 cup
sugar
4
large egg yolks, at room temperature
1 tsp
vanilla extract
2 1/4 cups
flour
3/4 tsp
baking soda
1/2
salt
9 oz
bittersweet chocolate, chopped into thin shards with a serrated knife
Coarse sugar, for dusting (optional)