In a large mixing bowl, whisk together the whole wheat flour, coconut sugar, baking powder, and salt. I recommend sifting the dry ingredients as it helps prevent clumps.
In a small bowl, whisk the whole wheat flour, coconut sugar, pink salt, baking soda, and baking powder.
In a separate, medium-sized bowl, mash the bananas until smooth. Whisk in the eggs, Greek yogurt, olive oil, and vanilla extract.
Gently fold the dry ingredients into the wet mixture. Stir until just combined to avoid overworking the batter, which can lead to a denser bread.