Pre-heat the oven to 350 degrees and grease a 9x5 inch (1.5 quart) loaf pan with butter (coconut oil if you can’t have the butter)
Blend the mashed bananas, eggs, coconut sugar, and yogurt in a medium mixing bowl until smooth.
Add the flour, cinnamon, baking soda, and sea salt and blend on low until smooth and combined. Be sure to "fluff" up the flour a bit before measuring - if it is too packed in the measuring cup there will be too much flour.
Pour the batter into your greased loaf pan and bake at 350 degrees for 55 minutes until the top springs back to touch and a toothpick comes out clean.
Let the banana bread cool in the pan at least 10 minutes before turning it out to cut into slices.