Preheat oven to 350°. Butter and flour 6 small aluminum loaf pans and place on a large cookie tray. Be sure to position them so air can pass freely or they will not cook evenly.
In a large bowl blend sugar, butter and eggs. Add mashed banana, extracts and sour cream.
Sift flour, baking soda and salt into batter. Stir into banana mixture taking care not to over mix or bread will be tough.
Combine brown sugar and cinnamon. Spoon half the batter into loaf pans and sprinkle half of the brown sugar/cinnamon mixture on batter. Continue to fill loaf pans with remaining batter. Sprinkle the remaining half of the brown sugar/cinnamon mix on top. *be sure pans are no more than 2/3 full or they will spill over.
Bake for 35-40 minutes. If using larger pans, it could take an hour to bake. Freezes well. I place in oven for about 5 minutes before serving to reheat bread.
Trust me, this one's a winner.