Creating One Bowl Chocolate Zucchini Bread is a straightforward process. Follow these steps for a delicious outcome:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a 9×5-inch loaf pan or line it with parchment paper.
2. Mix Dry Ingredients: In a large mixing bowl, combine the flour, sugar, cocoa powder, baking soda, baking powder, and salt. Whisk them together until well blended.
3. Add Zucchini: Fold in the grated zucchini, allowing it to mix evenly with the dry ingredients.
4. Combine Wet Ingredients: In the same bowl, add the vegetable oil, eggs, and vanilla extract. Stir until the mixture is just combined.
5. Incorporate Chocolate Chips: If using, fold in the chocolate chips and nuts at this stage.
6. Transfer to Pan: Pour the batter into the prepared loaf pan, spreading it evenly.
7. Bake: Place the pan in the preheated oven and bake for 50-60 minutes. A toothpick inserted in the center should come out clean.
8. Cool: Once baked, remove the bread from the oven and let it cool in the pan for about 10-15 minutes. Then, transfer it to a wire rack to cool completely.

Following these steps will lead you to a wonderfully moist and delicious loaf of chocolate zucchini bread that everyone will love.