1. Mix the flour, baking soda, baking powder, and salt.

2. Mix bananas, sugar, egg and butter and combine with dry mixture just until moistened.

3. Fill muffin cups 3/4 full.

4. For the topping combine the brown sugar, flour, and cinnamon.

5. Cut in butter until crumbly and sprinkle over muffins.

6. Bake at 375° for about 20 minutes, until muffins test done.

7. Cool in pan for 10 minutes.