Preheat your oven to 350°F. Lightly grease two 8×4-inch loaf pans with a dab of coconut oil or line with parchment paper.
In a bowl, whisk together the whole wheat flour, baking powder, and sea salt.
In a larger bowl, beat together the coconut sugar and applesauce until well combined. Whisk in the eggs one at a time, then stir in the vanilla extract. Blend in the mashed bananas until just mixed, keeping it lumpy for texture.
Gently fold the dry ingredients into the wet mix. Stir until just combined to keep the loaf tender. Fold in the walnuts.