Peel the bananas and add in the eggs, vanilla, and oil. Mix for about 1 minute on medium speed. Mix in 1 cup of white sugar, 1 cup of dark brown sugar, the yogurt, and the sour cream. Mix until combined.
Stir together the flour and baking soda, mix into the batter for 1 minute.
Pour half of the batter into a prepared bundt pan. Combine the cinnamon and sugar and sprinkle the mixture evenly over the batter. Cover with the rest of the batter, and spread gently if necessary.
Bake on the 2nd lowest rack for about 1 hour, or until a toothpick comes out with moist crumbs. Watch carefully! Your bread might take a little less time, or a little more time depending on the oven and your specific pan.