Preheat oven to 350°F (175°C) and line two baking sheets with parchment paper.
Whisk together the melted butter, dark brown sugar, and granulated sugar until smooth and lump-free.
Whisk in the blotted pumpkin puree, egg yolk, and vanilla extract until glossy.
Fold in the flour, pumpkin pie spice, cinnamon, baking soda, and salt until just combined, then fold in the chocolate chips.
Scoop 2-tablespoon dough balls onto the baking sheets and bake for 11-12 minutes until edges are set and centers remain soft.