Preheat oven to 350 degrees Fahrenheit and spray cookie sheets lightly with vegetable oil.
In a large bowl, mix together the cake mix and pumpkin with a fork, or mixer, until well-blended.
Drop by large rounded spoonfuls onto the cookie sheet. While cooking, they won't flatten out or expand much, so however you place them on the cookie sheet is how they will look when they come out of the oven. Helpful hint, take the back of a spoon and smooth out the top surface of the cookies into a rounded mound.
Bake for 15 minutes. Allow cookies to cool on baking sheet for up to five minutes before removing to a wire rack to cool completely.