Preheat oven to 350 degrees F.
Grease a 8.5" x 4.5" loaf pan and 12-muffin pan with cooking spray. Alternately, you can make two loaves or 24 muffins.
In a large bowl, whisk together mashed banana, brown sugar, oil, and eggs until well combined.
Add baking soda, baking powder, cinnamon, and salt, and whisk until well combined.
Add flour and stir in with a spatula.
Fold in grated zucchini.
Fill muffin tin up ~¾ of the way. Pour remaining batter into loaf pan.
Place muffin pan and loaf pan in oven.
Bake muffins for 20-22 minutes, or until tops spring back.
Bake loaf for 50-55 minutes, until top is golden brown and it springs back.
Let cool completely.
Serve and enjoy!
Note: these also freeze well!