Preheat the oven to 350 degrees.
In a large mixing bowl, mix together mashed banana, greek yogurt, vanilla, sugar, and eggs.
Slowly stir in the melted butter until blended.
On top of the wet ingredients, place the flour, flaxseed meal, baking soda, salt, and cinnamon. Mix until all of the ingredients are combined.
Pour into a standard loaf pan that's been sprayed with cooking spray, and bake for 55 minutes or until the center is cooked. You can check this with a toothpick or sharp knife. If no batter sticks to the toothpick then it's done.
Let the bread cool in the pan for about 10 minutes. Remove from pan and let it finish cooling on a wire cooling rack.
Cut into 16 pieces and serve.