Put cake mix, apple pie filling, eggs and cinnamon into mixing bowl. Stir together. Turn into greased 9 x 13 inch baking pan.
Mix butter, sugar and flour together until crumbly. Sprinkle over top. Bake in 350 f oven for about 50 minutes or until it tests done with a toothpick. Serve warm or cool. Cuts into 16 generous pieces.
OPTION: Also tasts great served warm with vanilla icecream! :).
NOTE: 1 hour time allocated in recipe includes prep time.