For the muffin batter in a large bowl whisk together the flour, baking soda, baking powder, salt, and cinnamon.
in another large bowl mix together the bananas, sugars, egg, vanilla, and oil. Mix the banana mixture into the flour mixture until just moistened; spoon equally into muffin tins lightly sprayed with cooking spray, or use liners.
For the topping in a small bowl combine all the ingredients together, using a fork press the butter into the ingredients until a crumbly mixture forms. Sprinkle the mixture equally over the top of the muffins.
Bake for 18 to 20 minutes for regular muffins, or 25 to 30 minutes for jumbos, or until a toothpick inserted comes out clean.