Preheat oven to 350 degrees Fahrenheit.
Coat a 9×5 inch loaf pan with a light layer of cooking oil.
If using soy or almond milk, add 1 tablespoon of lemon juice to it and let it stand until it curdles.
About 1 minute.
Skip this step if using apple sauce.
In a large bowl, mash up the bananas until smooth (can leave some chunks).
Add lemon juice, the curdled milk substitute or apple sauce, and agave nectar.
Stir to combine.
In another bowl, add flour, baking powder, baking soda and salt, and stir to combine.
Add the dry ingredients to the wet ingredients, and stir until combined and everything is moistened.
Toss in the blueberries and gently stir until evenly mixed.
Bake for 50 minutes, or until a toothpick inserted in the center comes out clean.
Cool completely in the pan before transferring to a plate.