Melt your butter in the microwave. Set it aside for about 15 to 20 minutes to cool slightly.
Stir together the butter and sugars until they are combined.
Add in the vanilla, and pumpkin purée. Stir till just combined.
Stir in the egg yolk.
Add in the flour, baking soda, salt, cinnamon, and pumpkin pie spice.
Fold in the chocolate chips
Cover the dough and refrigerate for one hour, up to overnight.
Preheat the oven to 350 degrees Fahrenheit.
Scoop the cookie dough into 1.5 to 2 TBS sized balls. Roll into balls and place on a lined cookie sheet.
Place pan into the oven and bake for 10-12 minutes, until cookies look set in the edges and mostly set in the middle.
Allow cookies to rest on the cookie sheet for another 4 to 5 minutes as they continue cooking on the pan.
Place a few extra chocolate chips on the top of each cookie for looks, if desired.
Remove from pan to a cooling rack and cool completely, or enjoy warm.