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Preheat oven to 375 degrees F. Lightly grease 12 muffin cups, or line with muffin liners.
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For the topping : In a medium bowl, mix flour, sugar and cinnamon. Add butter and mix with a fork or pastry cutter until crumbly.
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For the muffins : In large bowl, combine dry ingredients(flour, baking soda, baking powder and salt). Set aside.
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In another bowl, combine mashed bananas, sugar, slightly beaten egg, vanilla and melted butter. Mix well. Stir into dry ingredients just until moistened. Fill muffin cups two-thirds full.
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Sprinkle topping over muffin batter. Bake at 375 degrees for 18 to 20 minutes or until a toothpick inserted into center of a muffin comes out clean.
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Cool in pan 10 minutes before removing to a wire rack.
