Preheat your oven to 350 degrees and line a 12 cavity muffin tin with papers (I recommend spraying the papers with a little nonstick cooking oil since the muffins are so moist and can stick. You can also skip the papers and spay a non-stick muffin tin if you prefer).
In a large bowl stir together mashed banana, pumpkin puree, both sugars, eggs, milk and vanilla extract until well combined.
In a separate medium bowl, whisk together flour with baking soda, baking powder, cinnamon, ginger, nutmeg, cloves, and salt.
Fold the dry ingredients into the wet mixture and mix until just combined, taking care not to overmix.
Divide the batter evenly amongst muffin cups, filling each about ¾ of the way full. Sprinkle streusel topping evenly over the batter.
Bake for 17-20 minutes, until a toothpick inserted into the center of a muffin comes out clean.
Let muffins rest in pan for a few minutes before moving to wire racks to cool completely.