INGREDIENTS
1/2 cup
unsalted butter (room temperature)
1/4 cup
granulated sugar
1/4 cup
demerara sugar*
1/2 cup
light-brown sugar (packed)
1
large egg (room temperature)
1 tsp
vanilla extract
1 1/4 cups
all-purpose flour
1/4 tsp
baking soda
1/2 tsp
sea salt (plus more for sprinkling)
200 g
good quality dark chocolate (chopped)