INGREDIENTS
1/2 cup
unsalted butter, softened to room temperature
3/4 cup
packed light brown sugar
1/2 cup
granulated sugar
1
large egg + 1 egg yolk, at room temperature
1 tsp
vanilla extract
1/2 cup
Nutella, divided1
2
and 1/3 cups (295g) all-purpose flour (careful not to overmeasure here! spoon & level)
1
and 1/4 teaspoons baking soda
1 tsp
cornstarch
1/2 tsp
salt
1
and 1/4 cups (225g) semi-sweet chocolate chips, divided
sea salt,