Preheat oven to 375 degrees F (190 degrees C). Lightly grease 12 muffin cups, or line with muffin papers.
In a large bowl, mix together 1 ½ cups flour, baking soda, baking powder and salt.
In another bowl, beat together bananas, sugar, egg and the oil.
Stir banana mixture into flour mixture just until moistened.
Spoon batter into the prepared muffin cups.
In a small bowl, mix together brown sugar, 2 tablespoons flour and cinnamon.
Cut in 1 tablespoon butter until mixture resembles coarse cornmeal.
Sprinkle topping over muffins.
Bake in preheated oven for 18 to 20 minutes, until a toothpick inserted into center of a muffin comes out clean.