In large bowl beat bananas, sugar, egg and melted butter. In a separate bowl mix together,flour, baking soda and powder. Stir the flour mixture into the banana mixture until moistened. Using ice cream scoop to fill muffin tins.
In a small bowl, mix together brown sugar, 2 tbs. flour and cinnamon. With pastry fork, cut butter into mixture until coarse crumbs form. Sprinkle topping over muffins.