In a large bowl, combine the cake mix, oats, brown sugar and cinnamon. In another bowl, combine the egg, applesauce and chopped apple.
Combine the two mixtures and mix well.
Drop by heaping teaspoonfuls onto a baking sheet and bake for 10-12 minutes or until slightly golden brown. Let cool on the cookie sheets for a few minutes before transferring to wire racks to cool completely.