Preheat oven to 350 degrees and coat your two loaf pans with cooking spray
In the bowl of an electric mixer, beat eggs, sugar and oil on medium speed.
In a large bowl, whisk together the rest of the dry ingredients and set aside.
Beat in flour mixture, then add vanilla, banana, buttermilk and nuts/chocolate of choice
Divide the batter into your loaf pans and bake.
Rotate loaves half way through baking until a toothpick comes out clean (about one hour)
Transfer loaves to wire rack to cool.