04For the topping: Stir together the 1 cup of reserved cake mix, and the remaining 1/4 cup of sugar and 1 teaspoon of cinnamon. Cut in the 1/4 cup of butter dice using a pastry blender or a fork. Sprinkle evenly over the filling.
05Bake at 350F for 35-40 minutes, or until filling is set. Allow to cool completely, cut into bars, and serve!