01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - Whisk together flour, baking soda, salt, cinnamon, nutmeg, cloves, and ginger in a medium bowl until thoroughly blended.
03 - In a large bowl, whisk melted butter, brown sugar, and granulated sugar until smooth. Add pumpkin purée, egg yolk, and vanilla extract; mix until fully incorporated.
04 - Gradually add dry ingredients to wet ingredients, stirring until just combined. Do not overmix.
05 - Fold in chocolate chips until evenly distributed throughout the dough.
06 - Using a tablespoon or cookie scoop, drop dough onto prepared baking sheets, spacing approximately 2 inches apart.
07 - Bake for 11 to 13 minutes, or until edges are set and centers appear slightly underbaked.
08 - Let cookies cool on baking sheets for 5 minutes, then transfer to a wire rack to cool completely.