Preheat the oven to 350° F. Line a baking sheet with parchment paper.

Add the butter to a skillet set over medium heat. Cook until the butter begins to brown, about 3-4 minutes. Remove from the heat and transfer to a heatproof bowl. Let cool for 5 minutes.

Add brown sugar, pumpkin puree, egg, vanilla, and browned butter to a bowl and mix until smooth. Add the flour, oats, baking soda, pumpkin spice, and salt.

Gently fold the chocolate chips into the dough, being careful to not over-mix.

Using a large cookie scoop divide the dough into 8 equal sized balls. Gently flatten each ball to 1" thick.

Bake for 10-12 minutes.

Let the cookies cool on the baking sheet. They will continue to cook slightly as they sit on the baking sheet.