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Preheat the oven to 350 degrees and grease a bundt pan with baking spray.
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In a large bowl, cream butter until light and fluffy, about 1 minute. Add in granulated sugar and brown sugar, and beat until well combined. Add in eggs, 1 at a time, beating well after each addition. Set aside.
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In a separate bowl, sift together flour, baking soda, cinnamon and salt. Slowly incorporate the dry ingredients into the wet, mixing until just combined.
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Add in mashed bananas, sour cream, and vanilla extract. Mix until combined.
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Pour batter into the bundt pan and bake for 45-50 minutes, or until the cake is golden brown and cake tester comes out clean.