- Preheat the oven to 350°F. 
- Grease and flour a 9x5 loaf pan. 
- In a large bowl, combine the flour, baking powder, baking soda, salt, cinnamon, and nutmeg, using a whisk. Combine well and set aside.  
- In a medium bowl, whisk together the oil, brown sugar, granulated sugar, eggs, Greek Yogurt, and vanilla until combined. Stir in the zucchini. 
- Pour the wet ingredients into the dry ingredients and gently stir until all ingredients are incorporated.  
- Fold in optional nuts or chocolate chunks. 
- Spread the batter evenly into the prepared loaf pan. Bake for 50-70 minutes or until the loaf is set in the center, and when a toothpick is inserted, it only comes out with a few crumbs. If the top of the loaf looks like it is getting too brown while baking, cover with parchment paper to halt the browning.  
- Remove the bread from the oven and set it on a wire rack. Let it cool in the pan for 45 minutes to 1 hour before removing it from the pan.  
- Let the loaf rest until almost completely cooled, slice, and enjoy.