Preheat the oven to 350°F. Grease eight (4x2-inch) nonstick mini loaf pans with cooking spray.
In a large bowl, whisk together the flour, white sugar, brown sugar, baking soda and salt.
In a separate medium bowl, whisk together the mashed bananas, sour cream, eggs, vegetable oil and vanilla extract. Add the wet ingredients to the dry and mix just until combined. Fold in your mix-ins of choice then divide the batter among the mini loaf pans.
Bake the mini loaves until a toothpick inserted comes out clean, 25 to 30 minutes. Remove the loaves from the oven and let them cool completely in the pan before removing and serving.
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