Preheat your oven to 325 degrees F and line paper liners or muffin paper cups in a muffin pan (12 cup).
In a large bowl, mix in the mashed bananas, pureed pumpkin, sugar, cinnamon, eggs, vanilla extract, melted butter and salt.
Add the flour, baking soda, and baking powder and mix until just combined.
Add the chocolate chips and finally mix until almost combined.
Fill in the muffin cups with the prepared batter (almost to the top).
Add the flour, sugar, cinnamon, and melted butter in a medium bowl and mix using a spoon to combine the mixture.
Top the muffins with about 1 tablespoon, pressing the streusel topping onto the muffin butter to keep it from falling while baking in the oven.
Bake for about 18 to 20 minutes (check with a toothpick to make sure it’s done and be careful not to overbake them). Give them time to cool before you serve them.