Preheat oven to 300 degrees
In a small bowl, stir together ½ cup sugar and 1 teaspoon cinnamon.
Dust pans lightly with sugar mixture.
In a large bowl, mix butter and sugar until creamy.
Mix in eggs, mashed bananas, sour cream, vanilla and cinnamon.
Mix in salt, baking soda and flour. Stir in nuts.
Divide in 4 loaf pans and bake 1 hour until toothpick in center comes out clean.
