Prepare cake mix as directed on package, except use two tablespoons less water. Pour half of the batter into a well greased and floured 9-cup Mini-Bundt pan. Sprinkle with half of the prepared filling made by combining brown sugar, nuts and cinnamon. Pour in the rest of the batter. Sprinkle the top with the remaining filling. Bake at 350 degrees, for 50-60 min.