Mix cake mix, eggs, and oil in a large bowl. In a separate bowl, mix pudding mix and milk until well mixed. Add pudding to cake mix and mix well. Stir cinnamon and sugar together and set aside. Pour cake mix into greased, floured, bundt pan and sprinkle with cinnamon sugar. Bake cake as directed on box.
This can be served warm and is delicious as is. If you wish, frost it with a can of caramel icing while still slightly warm.