Preheat the oven to 180°C/350°F/gas mark 4.
Grease a 12 x 23 cm/9 x 5 inch loaf pan with coconut oil.
Mix together the dry ingredients (flours, baking powder, spices and salt) in a medium bowl.
Mash the bananas in another bowl, then add the melted coconut oil, almond milk, vanilla and maple syrup and mix everything together using a rubber spatula.
Gradually mix the dry ingredients into the banana mixture until everything is well combined. Fold in the chocolate chips.
Pour the batter into the prepared loaf pan and sprinkle the top with the pecans or walnuts. Bake the loaf in the preheated oven for 45–50 minutes, rotating halfway through the cooking time.
Remove from the oven and leave to cool to room temperature in the pan before turning out. Serve toasted with nut butter for breakfast, or warm with vanilla ice cream for dessert.