In a large bowl, add the butter, brown sugar, and granulated sugar. Beat until well combined, about 1-2 minutes.
Add the egg yolk and vanilla extract and beat to combine.
Add the pumpkin puree and beat to combine.
Add the cinnamon, nutmeg, ginger, cloves, baking soda, and salt and beat to combine.
Add the flour and oats and beat to combine.
Fold in the chocolate chips.
Chill the dough for 30 minutes.
Preheat the oven to 350 degrees F.
Line a baking sheet with parchment paper.
Using a cookie dough scoop scoop up balls of dough 1 ½" in diameter and then roll them between palms to smooth out.
Bake in preheated oven for 11-13 minutes, until slightly golden around the edges.