Melt butter partially in microwave and set aside.
In a mixing bowl add flour, oats, soda, powder, pumpkin pie spice, and salt.
In a separate bowl whisk together butter and sugars until smooth. Add in egg yolk and vanilla, mix well. Add in pumpkin.
Add your dry ingredients into your wet. Stir with a spoon. Stir in your chocolate chips.
Cover and refrigerate for 45-60 mins.
Preheat oven to 350. Spray baking sheet.
Scoop dough out and roll into ball. I like to make my dough a little big taller and less wide so that I get taller cookies. Place on greased cookie sheet.
Bake for 9-11 minutes. Take out and let cool for about 5 minutes. Remove to cooling rack. Let cool a little bit longer and then add some chocolate chips to the top. If you add chocolate chips to early to the top they will melt.