INGREDIENTS
1 1/2 cups
all-purpose flour (spooning into measuring cups, then leveling)
1 1/4 tsp
Diamond Crystal or ¾ tsp. (4 g) Morton kosher salt
3/4 tsp
baking soda
3/4 cup
(1½ sticks; 169 g) unsalted butter, divided
1 cup
(packed) dark brown sugar
1/4 cup
granulated sugar
1
large egg
2
large egg yolks
2 tsp
vanilla extract
6 oz
bittersweet chocolate (60%–70% cacao), coarsely chopped, or semisweet chocolate chips