Preheat oven to 350°F.
Grease a 9×5-inch loaf pan (or 8½×4½-inch) with non-stick spray or butter and flour.
In a large bowl, combine flour, baking powder, baking soda, salt, brown sugar, granulated sugar, oil, vanilla, and eggs.
Stir until thick.
Fold in grated zucchini until evenly mixed. Batter will thin slightly.
Pour into prepared pan and smooth top.
Bake for 65–75 minutes, until a toothpick inserted in the center comes out with crumbs but no wet batter.
See full steps with tips & photos → https://theboatshedcafe.com/the-best-zucchini-bread/