In a large bowl, combine the cake mix, water, eggs and applesauce; beat on low speed for 30 seconds. Beat on medium for 2 minutes. Stir in the bananas, chips and walnuts.
Transfer to a 10-in. fluted tube pan coated with cooking spray and sprinkled with flour. Bake at 350° for 40-50 minutes or until a toothpick inserted in the centre comes out clean. Cool for 10 minutes before removing from pan to a wire rack to cool completely.