INGREDIENTS
1/2 cup
butter, room temperature
1/2 cup
white sugar
1/2 cup
light brown sugar
1
large egg, room temperature
2 tsp
vanilla extract
1 cup
plus 2 tablespoons flour
2 tsp
cornstarch*
1/2 tsp
salt
1/2 tsp
baking soda
1/4 tsp
baking powder
1 cup
old-fashioned oats
2/3 cup
white chocolate chips
1 cup
fresh blueberries