Prep. Preheat your oven to 325 degrees Fahrenheit and either grease a 4.5" x 8.5" loaf pan with oil or line it with parchment paper. Set aside.
Step 1 - Mix wet ingredients. In a large mixing bowl, whisk together eggs, mashed bananas, yogurt, milk, maple syrup, vanilla extract, and coconut oil until the mixture is smooth.
Step 2 - Mix dry ingredients. In a separate bowl, combine whole wheat flour, baking soda, cinnamon, and salt.
Step 3 - Combine wet and dry ingredients. Using a sifter, gradually add these dry ingredients to the banana mixture in two batches.
Step 4 - Mix ins (Optional). If you want to add some sweetness and extra flavor add ½-¾ cup of chocolate chips or ½ cup dried fruit/nuts now. Stir with a spatula until the ingredients are well combined.
Step 5 - Bake. Pour the batter into the greased loaf pan and bake for 60 minutes. Cut one larger banana in half and lay it over the top of the batter. Press it to encase it in the batter. Once baked, the banana caramelizes, contributing moisture and additional sweetness to the bread.
Check for doneness around the 50-minute mark using a toothpick.
Once baked, let the bread rest in the pan for 10 minutes before transferring it onto a wire rack to cool completely.