Preheat your oven to 350°F (175°C) and grease a 9x5 inch loaf pan.

In a large bowl, combine the grated zucchini, sugar, and oil.

Beat in the eggs and vanilla extract until well blended.

In another bowl, whisk together the flour, baking soda, baking powder, cinnamon, and salt.

Gradually add the dry ingredients to the wet mixture, stirring until just combined.

Fold in the chopped walnuts gently if using.

Pour the batter into the prepared loaf pan, smoothing the top with a spatula.

Bake in the preheated oven for 45-50 minutes, or until a toothpick inserted into the center comes out clean.

Allow the bread to cool in the pan for 10 minutes before transferring it to a wire rack.

Slice and enjoy your delicious zucchini bread once it's cooled completely!