Heat oven to 350 degrees F. Lightly coat a 6-cup or 9×5-inch loaf pan with nonstick spray. May have extra batter for a couple muffins.
Place grated zucchini in a large bowl and add oil, eggs, sugars, vanilla, and salt. Use a fork to mix until combined.
Sprinkle cinnamon, nutmeg, baking soda, and baking powder over surface of batter and mix until combined. Add flour and mix until just combined.
Pour into prepared loaf pan and smooth the top. Sprinkle with the raw or turbinado sugar. Bake for 55 to 60 minutes.
Let cool completely in the pan. Leave in pan, unwrapped, overnight or 24 hours, until removing and serving in slices.
Zucchini bread keeps for 4 to 5 days at room temperature. Wrap only the cut end of the cake in foil, and return it to the baking pan, leaving the top exposed.
