Preheat oven to 350ºF.
Grease muffin pan with cooking spray and set aside.
In a large bowl, whisk together the flour, sugar, baking soda and salt.
In a separate bowl, combine the mashed bananas, sour cream, eggs, butter and vanilla.
Delicately fold the banana mixture into the dry mixture until the ingredients are just combined. (Do not overmix the batter.)
Fold 1 cup of the granola into the batter.
Pour the batter into the prepared muffin pan. Sprinkle the remaining 3/4 cup granola on top of the muffins then spritz the granola lightly with cooking spray to prevent it from browning.
Bake the muffins for 10-15 minutes, until a toothpick inserted into a muffin comes out clean.
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