INGREDIENTS
2 1/4 cups
old-fashioned oats, divided
1 tbsp
cornstarch
1/2 tsp
baking powder
1/2 tsp
coarse salt
1/2 cup
unsalted butter, at room temperature
1/3 cup
granulated sugar
1/3 cup
light brown sugar, packed
1
large egg
1 tsp
vanilla extract
1 cup
dark chocolate, roughly chopped