My friend Tanya made this for us and it was delicious!
1 Yellow Cake Mix (or white)
1/2 cup of oil
1/4 cup of water
8 oz. container of sour cream (1 cup)
1 small package of instant vanilla pudding (not made up)
2/3 cup brown sugar
1 1/2 to 2 tsp cinnamon
Mix well. Grease and flour bunt pan. Pour half of cake mixture in. Take half of cinnamon mixture and sprinkle it over the layer of cake. Pour other half of cake mix in and then top with cinnamon mixture again. Take a knife and go almost all the way down and swirl it around so cinnamon mixes in (zig zag). Bake at 350 degrees for 1 hour. Cool for around 10 minutes and then flip over on plate and serve warm with ice cream if desired. Tastes great the next day cold.