1 pkg. yellow cake mix
4 eggs
1/3 c. oil
1/2 c. water
1 pkg. vanilla pudding
3/4 tsp. cinnamon
1 1/2 c. mashed ripe bananas

Combine all ingredients in a large bowl. Mix until blended, then at medium speed for 4 minutes. Pour into a greased and floured tube pan. Bake at 350 degrees for 1 hour. Cool - turn onto rack. Dust with powdered sugar.