INGREDIENTS
2 1/2 cups
all-purpose flour
2 tsp
cornstarch
3/4 tsp
salt
1 tsp
baking powder
1 tsp
baking soda
1 cup
unsalted butter, softened to room temperature
1/2 cup
granulated sugar
1 1/2 cups
packed brown sugar
1
large egg plus 2 egg yolks at room temperature
1 tbsp
pure vanilla extract
1 cup
chocolate chips
1 cup
butterscotch chips