Using paper towels or a clean tea towel, wrap up the pumpkin puree ion a few layers of paper towels or a tea towel, and squeeze out excess liquid.
Cream the butter, granulated sugar, and light brown sugar for 2-3 minutes until fully combined, scraping down the sides of the bowl as necessary.
Mix in vanilla extract, pumpkin puree, and egg yolk.
Add flour, baking soda, baking powder, salt, and cinnamon. Mix until just combined.
Gently fold in chocolate chips.
Chill the cookie dough 30 minutes. If desired, pre-scoop the cookie dough into 2 tablespoons balls of dough before chilling.
While dough is chilling, preheat oven to 350 ℉.
Put the chilled dough balls onto a baking sheet lined with parchment paper or silicone baking mat, keeping the cookies 2-3 inches apart as they’ll spread in the oven.
Bake in the pre-heated oven for 9-12 minutes until the edges start to brown. Remove from oven and immediately tap the pan on the top of the oven to help the cookies settle down.
Let cool on the baking tray for a 5-10 minutes.
Once they’ve started to firm up move the cookies to cooling rack to finish cooling. Once cool, enjoy!