Preheat the Oven: Preheat your oven to 350°F (175°C). Grease the loaf pan with a bit of oil or line it with parchment paper for easy removal.
Prepare the Zucchini: Grate the zucchini using a grater. Place the grated zucchini in a clean kitchen towel or paper towel, and squeeze out as much excess moisture as possible. Set aside.
Mix Dry Ingredients: In a large mixing bowl, whisk together the whole wheat flour, rolled oats, baking soda, baking powder, salt, cinnamon, and nutmeg. If desired, sift the flour to eliminate any lumps.
Mix Wet Ingredients: In a medium mixing bowl, whisk together the eggs, applesauce, maple syrup or honey, melted coconut oil, and vanilla extract until well combined.
Combine Wet and Dry Ingredients: Pour the wet ingredients into the dry ingredients and gently stir with a spatula until just combined. Be careful not to overmix, as this can result in dense bread.
Add Zucchini and Mix-ins: Fold in the grated zucchini. If using nuts, raisins, or chocolate chips, fold those in as well.
Bake the Bread: Pour the batter into the prepared loaf pan and smooth the top with a spatula. Bake in the preheated oven for 45-55 minutes, or until a toothpick inserted into the center comes out clean.
Cool: Allow the zucchini bread to cool in the pan for about 10 minutes, then transfer it to a wire rack to cool completely.
Slice and Serve: Once the bread is completely cooled, slice it into 12 pieces. Enjoy it as a healthy breakfast or snack!