Preheat oven to 325° F and spray a 1lb loaf pan with nonstick spray. Set aside. *
Mash your bananas. Mash the bananas until they have a smooth liquid behavior (some lumps are fine). I like to mash mine on a paper plate, I find a flat surface is easier than smashing them in a bowl. The better you mash them, the smoother the texture of your bread.
In a small mixing bowl, combine the dry ingredients. The whole wheat flour, baking soda, salt, and cinnamon all need a moment together.
Next, grab a large mixing bowl. Using a whisk, vigorously mix the mashed bananas, oil (make sure it's cooled if it's coconut oil!) eggs, and honey. Then add the apple cider vinegar, vanilla extract, and milk of choice.
Gently fold in the dry ingredients into the wet ingredients. A few streaks of flour are okay, and even recommended! We do not want an over mixed batter that will result in a dense bread.
My favorite part: The mix-ins! Feel free to add up to a cup and a half of your favorite add-ins. *
Pour the prepared batter into the greased loaf pan. Bake at 325° F for 50-55 minutes, or until a toothpick comes out mostly clean, with a few crumbs. *