Preheat the oven to 350 degrees F. Spray two muffin tins with cooking spray; set aside.
In a medium-sized bowl, whisk the flour, salt, ginger, cinnamon, cloves, allspice, nutmeg, baking powder, and baking soda together. Set aside.
In another medium-sized bowl, combine the bananas, butter, eggs, vanilla extract, granulated sugar, brown sugar, and molasses.
Add the dry ingredients to the wet and mix until just combined.
Scoop the batter into the prepared muffin tins, filling them approximately 3/4 of the way full.
Toss all ingredients together with a fork until crumbly.
Top the muffin batter with the crumb topping, dividing it evenly between each of the muffins.
Bake the muffins for 20 minutes, or until a toothpick, when inserted into the center of a muffin, comes out clean.