Step 1: Preheat Oven
Preheat oven to 350°F (175°C). Grease a 9x5-inch loaf pan or line with parchment paper.
Step 2: Mix Dry Ingredients : In a medium bowl, whisk together flour, baking soda, baking powder, salt, cinnamon, and nutmeg (if using).
Step 3: Mix Wet Ingredients : In a large bowl, whisk together vegetable oil, granulated sugar, brown sugar, eggs, and vanilla extract until smooth.
Step 4: Combine Wet and Dry Ingredients : Gradually fold the dry ingredients into the wet mixture until just combined. Do not overmix.
Step 5: Add Zucchini and Nuts : Fold in grated zucchini and nuts (if using) until evenly distributed.
Step 6: Prepare Cinnamon Sugar Topping : In a small bowl, mix 2 tablespoons sugar with 1/2 teaspoon cinnamon. Set aside.
Step 7: Pour Batter and Add Topping : Pour the batter into the prepared loaf pan and sprinkle the cinnamon sugar evenly on top.
Step 8: Bake : Bake for 55-60 minutes, or until a toothpick inserted into the center comes out clean. Allow the bread to cool in the pan for 10-15 minutes before transferring to a wire rack to cool completely.