Preheat oven to 350°F (175°C). Line 2 baking sheets with parchment or use a nonstick baking sheet.
Whisk flour, cornstarch, baking powder, soda, spices, and salt.
2 ¾ cups unbleached all-purpose flour, (RECOMMEND WEIGHING), 2 tbsp cornstarch, 1 tsp baking powder, 1 tsp baking soda, 2 tsp ground cinnamon, ½ tsp ground nutmeg, ½ tsp ground cloves, ½ tsp fine salt
In a separate bowl or your stand mixer, cream together butter sugar until fluffy.
½ cup salted butter, softened, 1 ½ cups granulated sugar
Add pumpkin puree, egg, and vanilla. Beat until smooth making sure to scrape the sides of the bowl.
1 cup canned pumpkin purée, 1 large egg, 1 tsp vanilla extract
Mix in the dry ingredients on low just until combined. The dough will be very soft and sticky.
Scoop dough onto your baking sheets 2 inches apart. Optional: wet fingers and press to 1 cm thick.
Bake 13–15 min until edges are set and tops spring back when touched. Cool on sheet 5 min then transfer to a wire rack to cool completely.
To Make Frosting:
Beat cream cheese and butter for 1 minute. Add sifted powdered sugar and cornstarch. Whip for 2 min until light and fully incorporated. Add vanilla and salt and mix until fully incorporated.