Beat butter, brown sugar, and white sugar together in a bowl until creamy. Add pumpkin, egg, and vanilla extract; beat until smooth.
Mix flour, oats, cinnamon, baking soda, baking powder, and salt in a separate bowl; stir into creamed butter until combined. Fold chocolate chips into batter. Drop 1 to 2 tablespoons batter for each cookie onto a baking sheet.
Bake in the preheated oven until the edges of each cookie are lightly browned, 10 to 12 minutes.