Preheat oven to 350 degrees and spray a 9x5 baking pan with non-stick spray.
In a bowl sift together flour, baking powder, baking soda, salt, then add lemon zest, and whisk or stir together until combined.
In a large bowl, whisk together oil, Greek yogurt, lemon juice and sugar until very well combined.
Add in the eggs, one at a time, beating well after each addition.
Pour dry ingredients into wet ingredients, and mix until almost combined.
Add in zucchini and vanilla extract and continue stirring until just combined.
Pour batter into your prepared baking loaf pan.
Bake for 50-55 minutes, or until a cake tester comes out clean.
Allow to cool at least 15 minutes before removing from the pan to place on a cooling rack.