Heat oven to 350°F and prepare loaf pans. (I used three small loaf pans.)
In large bowl add flour, baking soda, baking powder, salt, cinnamon, and oats. Stir together.
In a smaller bowl combine sugar, eggs, oil, vanilla, and mashed banana. Pour sugar mixture into the flour mixture and stir by hand. Add in zucchini and mix until well incorporated.
Bake for 35-45 minutes or until bread pulls away from sides of pan and an inserted toothpick is removed clean.