Preheat oven to 350°F and prepare a muffin pan with large cupcake liners.
Grate (shred) zucchini, using a cheese grater. Lay the shredded zucchini on a paper towel or a clean towel and press down/squeeze out any excess water. Set aside.
In a large bowl add the flour, baking soda, baking powder, cinnamon, cardamom, and salt.
On a dinner plate, mash the bananas with a fork.
In a large bowl, add the bananas, both sugars, eggs, oil, and vanilla. Stir until combined.
Add in the dry ingredients, and mix well (it’s okay for the batter to be a little lumpy).
Stir in the shredded zucchini and mix until incorporated.
Fill the cupcake liners ⅔ full. You can use a scoop or a large spoon.
Bake for 25 minutes, or until tops are rounded and golden brown.