01 - Preheat the oven to 350°F. Grease a 9x5-inch loaf pan or line it with parchment paper.
02 - In a large bowl, whisk together the eggs, vegetable oil, brown sugar, granulated sugar, and vanilla extract until smooth.
03 - Fold the mashed bananas and grated zucchini into the wet mixture, stirring until evenly combined.
04 - In a separate bowl, whisk together the flour, baking soda, baking powder, salt, cinnamon, and nutmeg.
05 - Gradually fold the dry ingredients into the wet mixture until just combined. Do not overmix.
06 - Gently fold in chopped nuts or chocolate chips if desired.
07 - Pour the batter into the prepared loaf pan and smooth the top with a spatula.
08 - Bake for 50 to 55 minutes, or until a toothpick inserted into the center comes out clean.
09 - Allow the bread to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.