In a large bowl, or in the bowl of a stand mixer, mix the butter and granulated sugar until the color is very light, about 5-7 full minutes.
Add 2 Tbsp maple syrup, molasses, pumpkin puree, egg, and vanilla and mix well until combined.
Add flour, baking powder, baking soda, salt, corn starch, and pumpkin pie spice and mix until JUST combined.
Using a cookie scoop, scoop dough onto the prepared baking sheet. 1 scoop of dough will yield smaller, more bite-sized cookies. 2 scoops of dough will yield slightly bigger, more “normal” sized cookies.
Bake for 15 minutes, or until the cookies are golden to light brown underneath. Allow the cookies to cool completely before frosting.
Meanwhile, prepare the frosting. In a stand mixer, blender OR by hand, combine the cream cheese, butter, vanilla and maple syrup in a medium bowl. Add the salt and taste, adjusting sweetener as desired.
Smear frosting on each cookie and sprinkle with additional cinnamon for decoration, if desired.