Preheat the oven to 350F degrees.
Line a loaf pan with parchment paper, and set aside.
In a medium bowl whisk together the flour, cinnamon, baking powder, baking soda & salt.
In a separate large bowl mix together the oil and sugar until it is well incorporated.
Whisk in the eggs and vanilla extract then stir in the mashed bananas.
Fold the flour mixture into the banana mixture.
Then fold in the grated zucchini.
Pour into the prepared pan and bake for 50-60 minutes. Check for doneness with a toothpick.
Cool fully before slicing.