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Preheat oven to 375 and grease/line a mini muffin tray.
In a medium bowl, combine the flour, baking soda, baking powder, and salt.
In a separate bowl, combine the bananas, sugar, egg, and melted butter.
Stir the banana mixture into the dry mixture and mix until just combined.
Spoon batter into prepared muffin cups, about 2/3 full.
In a small bowl, mix together the brown sugar, flour, and cinnamon.
Using two forks, cut in the 1 tbsp. butter to the cinnamon mixture until mixture resembles coarse cornmeal.
Sprinkle topping over the muffin cups.
Place muffin tray in preheated oven and bake for 10-12 minutes.
Remove tray from oven and allow to cool for 1-2 minutes before removing from tray!