In a large bowl, combine the cake mix, Cheerios™, 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 at 375 degrees F for 10-12 minutes or until slightly golden brown. (I used a 2 TBSP cookie scoop so that my cookies were a bit larger. Bake at 375 degrees F for 12-14 minutes.)