Preheat the oven to 350 F and grease a 9x5-inch loaf pan with non-stick cooking spray.
In a large mixing bowl, whisk together the eggs, oil, vanilla and sugar. Then add the flour, baking soda, baking powder, salt and cinnamon. Stir until batter forms.
Grate the zucchini, chop the rhubarb, zest the orange, and fold all together into the batter. Pour the batter into the prepared baking dish.
Bake in the preheated oven for 55 to 60 minutes, or until cooked through in the middle.
Serve Rhubarb Zucchini Quick Bread warm with butter. Enjoy!