Preheat oven to 350ºF
Add pumpkin puree, unsalted butter, white sugar, and dark brown sugar to a large bowl. Mix together until the batter is fluffy.
Next, add in one egg yolk and vanilla. Then mix for 2-3 minutes until fully incorporated.
Add your dry ingredients - flour, old-fashioned oats, baking soda, baking powder, and salt. Mix until incorporated. The mixture will take a little time to come together.
Once incorporated, fold in most of the chocolate chips. Save a few for the top of the cookies.
Scoop the cookies, roll the cookie dough ball and slightly flatten.
Top with remaining chocolate chips.
Bake cookies at 350ºF for 14-16 minutes until fully baked. The cookies will look less shiny when done.
Cool slightly, and enjoy!