Preheat the oven to 350°F. Spray two 9x5-inch bread pans with cooking spray.
In a large bowl, mix sugar, butter, and eggs. In a separate bowl, dissolve baking soda in sour cream and add it to the sugar mixture. Add bananas, salt, and 2 cups flour. Stir until combined.
Divide the batter into 2 bowls. Now take the batter from the first bowl and pour it evenly into two bread pans.
Mix cream cheese, sugar, egg, and flour in a bowl until smooth and creamy. Layer evenly over the mixture in both bread pans.
Divide the batter from the second bowl evenly in both pans, covering the layer of cream cheese.
Sprinkle top with 1 tablespoon of sugar mixed with ½ teaspoon cinnamon before baking.
Bake for 50 min. Cool and serve.