INGREDIENTS
1 cup
all-purpose flour
3/4 tsp
baking powder
1/2 tsp
baking soda
1/2 tsp
salt
14 tbsp
butter (1¾ sticks), softened but still slightly cool
1 cup
granulated sugar
1/4 cup
packed light brown sugar
1
large egg
1 tsp
vanilla extract
1/2 tsp
cinnamon (optional)
2 1/2 cups
old-fashioned rolled oats * NOT quick oats