Preheat your oven to 350°F (175°C) and grease two 8x4-inch loaf pans with butter or cooking spray.

In a medium bowl, whisk together the flour, sugar, baking powder, baking soda, cinnamon, and salt.

In a large bowl, combine the grated zucchini, vegetable oil, eggs, and vanilla extract. Mix until well combined.

Gently fold the dry ingredients into the wet mixture using a spatula until just combined.

Divide the batter evenly between the two prepared loaf pans, filling each about two-thirds full.

Place the loaf pans in the preheated oven and bake for 50-60 minutes, checking for doneness at the 50-minute mark.

Once baked, remove from the oven and allow to cool in the pans for 15 minutes before transferring to a wire rack.