01 -
Place the pumpkin purée between several layers of paper towel and gently press to remove excess moisture. Repeat until the pumpkin becomes noticeably thicker.
02 -
In a medium bowl, whisk together the flour, baking soda, cornstarch, cinnamon, pumpkin pie spice, cream of tartar, and salt.
03 -
In a large mixing bowl, beat the softened butter, granulated sugar, and brown sugar until creamy. Add egg yolk, vanilla extract, and blotted pumpkin. Mix until smooth.
04 -
Gradually add the dry ingredients to the wet mixture, mixing until a soft dough forms. Avoid overmixing.
05 -
Cover the bowl and refrigerate the dough for 30 to 45 minutes to firm up.
06 -
Preheat oven to 175°C (350°F). Line two baking sheets with parchment paper. Combine 1/3 cup granulated sugar and 2 teaspoons cinnamon in a small bowl.
07 -
Scoop approximately 1 1/2 tablespoons of dough for each cookie. Roll into balls and coat generously in cinnamon-sugar. Place on prepared baking sheets 2 inches apart and slightly flatten.
08 -
Bake for 10 to 12 minutes, until edges set but centers are still soft. Let cool on the baking sheet for 5-10 minutes before transferring to a wire rack to cool completely.