Combine butter and sugars.
Add eggs and maple syrup, and stir.
Add in flour, cornstarch, baking powder, and salt, and mix until combined.
Refrigerate the dough for 30 min - 1 hour.
Preheat oven to 325° F.
Combine the remaining sugar and cinnamon.
Form balls of dough, about 1 - 1 1/2tablespoons.
Roll the dough balls into the cinnamon sugar mixture, and place on the baking sheet a couple inches apart.
Using your palm, slightly flatten each dough ball into a thick disc.
Bake for about 10-12 minutes, untilslightly golden brown.
Let the cookies cool for about 5 minutes on the pan, andthen move to a wire rack to cool completely.