In a large bowl, beat together butter, brown sugar, and white sugar until creamy. Add in pumpkin, egg, and vanilla extract and stir until smooth.
In a large separate bowl, mix together flour, oats, cinnamon, baking soda, baking powder, and salt. Fold in wet ingredients and incorporate until combined.
Fold chocolate chips into batter.
Drop 1 to 2 tablespoons batter for each cookie onto a baking sheet.
Bake for 10-12 minutes or until the edges of each cookie are lightly browned.
Notes
For this particular recipe, I recommend using quick cooking oats. These are found by all the other oats, in the cereal aisle.