Preheat your oven to 350°F (175°C). Grease or line a 9x5-inch loaf pan.
In a large bowl, mash the banana. Add in eggs, yogurt, vanilla extract, zucchini, and raspberries. Mix gently.
In another bowl, whisk together the flour, baking soda, baking powder, cinnamon, nutmeg, and salt.
Gradually add dry ingredients to wet mixture. Stir until just combined — don't overmix!
Fold in optional ingredients like walnuts or white chocolate chips.
Pour the batter into the prepared pan. Smooth out the top.
Bake for 50–60 minutes, or until a toothpick inserted in the center comes out clean.
Let the bread cool in the pan for 10 minutes before transferring to a wire rack.