Preheat your oven to 350°F (175°C) and line a 9×5-inch loaf pan with parchment paper.

In a large mixing bowl, mash the very ripe bananas until mostly smooth with some lumps.

Add the mashed bananas, eggs (or flax eggs), maple syrup, Greek yogurt, melted coconut oil, and vanilla extract to the bowl and mix well.

In another bowl, whisk together the whole wheat flour, baking soda, sea salt, and cinnamon.

Gently fold the dry mixture into the wet ingredients, being careful not to overmix. If using, fold in chocolate chips or walnuts.

Pour the batter into the prepared loaf pan and smooth the top with a spatula.

Bake for 45-50 minutes. Check doneness by inserting a toothpick; it should come out clean.

Allow the bread to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely for about 15 minutes before slicing.