Heat oven to 350°F (180°C) and fold a 9x5 (20x10 cm) loaf pan with parchment paper or grease it with oil.
In a large bowl, mash the bananas then combine with pureed pumpkin, egg, maple syrup, vanilla extract, pumpkin spice mix and a pinch of salt. Stir well until you get a smooth mixture.
Add into the wet mixture whole-wheat flour, almond flour (or more whole-wheat flour) and baking powder. Stir the ingredients together. You may need to adjust with little flour more if the batter is too liquid, or with a splash of milk if it is too dry. This depends on the size of the bananas used.
Fold through chocolate chips or favorite mix-ins, if desired.
Transfer the batter to the prepared pan, then bake in hot oven for about 30-37 minutes. The bread is ready when a toothpick inserted into its center comes out clean. Let cool for at least 15 minutes before serving.