Preheat the Oven and Prepare the Pan: Preheat your oven to 350°F (175°C). Grease a 9x5-inch loaf pan or line it with parchment paper.
Prepare the Zucchini and Orange: Shred the zucchini finely and squeeze out excess moisture. Zest and juice the orange, setting both aside. Mix Dry Ingredients: In a medium bowl, whisk together the all-purpose flour, baking powder, baking soda, cinnamon, nutmeg, and salt.
Prepare Wet Ingredients: In a large bowl, whisk together the eggs, white sugar, brown sugar, olive oil (or butter), vanilla extract, orange zest, and orange juice.
Combine the Wet and Dry Ingredients: Slowly add the dry ingredients into the wet ingredients, stirring gently until just combined.
Fold in the Zucchini: Gently fold in the shredded zucchini, ensuring it's evenly distributed throughout the batter.
Bake the Bread: Pour the batter into the prepared loaf pan and spread it evenly. Bake for 50-60 minutes, or until a toothpick inserted into the center comes out clean. Cool and Serve: Let the bread cool in the pan for 10 minutes before transferring it to a wire rack to cool completely. Slice and serve.