In large mixing bowl, combine flour, baking soda, cinnamon and salt; set aside.
In another large mixing bowl, combine sugar and butter; using an electric mixer on medium speed, beat until creamed.
Mix in bananas, sour cream and vanilla. Add to dry ingredients, stirring until just combined. Transfer to a greased 9x5-inch loaf pan.
Bake in a preheated 350°F oven 60-70 minutes or until toothpick inserted in center comes out clean. Remove from pan; cool completely on cooling rack.
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