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Preheat oven to 400 degrees and grease a mini muffin pan.
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Add bananas to a large mixing bowl and mash with whisk until smooth.
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Add brown sugar, egg, applesauce, and vanilla extract. Whisk until combined.
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Add oats, flour, cinnamon, baking powder, baking soda, and salt. Whisk until combined.
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Spoon batter into muffin pan and bake for 15 to 20 minutes, or until golden brown.
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Allow to cool completely before serving.