Preheat oven to 350F. Spray or wipe a 9×5-inch loaf pan with oil (I used a silicon loaf pan).
Mix the soymilk with 1 tablespoon of the lemon juice and let stand until it curdles. (If using applesauce, skip this step and add the lemon juice to the bananas.)
In a large bowl, mash the bananas and add the remaining lemon juice, soymilk, and agave nectar. Stir well to combine.
In a separate bowl, combine the flour, baking powder, soda, and salt.
Add the dry ingredients to the banana mixture, and stir just until the mixture is well-combined. Fold in the blueberries.
Spread the mixture evenly in the prepared pan and bake until a knife inserted in the center comes out clean, about 50-60 minutes.
Allow cooling before cutting and serving. Cut into 12 Equal Slices