Preheat oven to 350°F.
In a mixing bowl, sift together flour, baking soda, salt and cinnamon.
Mash the bananas in a separate bowl until smooth.
In a stand mixer fitted with the paddle attachment, cream together butter and sugar for 3-5 minutes at medium speed, or until fluffy. Add in eggs one at a time until mixture is fully combined. Add in vanilla, sour cream and mashed bananas. Turn down to low speed and add flour mixture in batches.
Spray a 9x5-inch loaf pan with cooking spray. Pour batter into the loaf pan and bake in the oven for 1 hour or until a toothpick comes out clean.
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