Preheat oven to 375 degrees. In large bowl, mix together flour,
baking soda, baking powder, and salt. In another bowl beat
together bananas, sugar, egg, and melted butter. Stir the banana
mixture into the flour mixture just until moistened. Spoon batter
into sprayed or lined muffin cups.
Crumb Topping- In small bowl, mix together brown sugar, flour,
and cinnamon. Cut in butter until mixture resembles coarse
cornmeal. Sprinkle topping over muffins.
Bake for 18-20 minutes.
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