Preheat the oven to 350 degrees F. In a large bowl mash 3 ripe bananas. Add egg, sugar, vanilla, and cinnamon. Fold together well. Stir in the melted butter.
Add flour, baking soda and salt. Stir well. Add paper muffin papers into holes and spoon approximately 1 ½ tsp of the batter into prepared mini muffin tins.
In a separate bowl, combine ingredients for the pecan topping until you have a crumbly texture. Spoon a small amount of mixture onto each muffin.
Bake for approximately 10 -12 minutes, do not over bake. Remove when tops spring back when gently touched.