Preheat your oven to 350°F (175°C) and grease a 9x5-inch loaf pan.
In a large mixing bowl, combine the mashed bananas and pumpkin puree until smooth.
Add the vegetable oil, granulated sugar, brown sugar, and vanilla extract to the banana-pumpkin mixture, and mix until well combined.
In a separate bowl, whisk together the all-purpose flour, baking soda, baking powder, cinnamon, nutmeg, cloves, and salt.
Gradually add the dry ingredients to the wet mixture, stirring gently until just combined. Be careful not to overmix; a few lumps are okay.
If desired, fold in the chopped walnuts or pecans and chocolate chips for added texture and flavor.
Pour the batter into the prepared loaf pan, smoothing the top with a spatula.
Bake in the preheated oven for 55-65 minutes, or until a toothpick inserted into the center comes out clean.
Once baked, remove the bread from the oven and let it cool in the pan for about 10 minutes before transferring it to a wire rack to cool completely.