Preheat oven to 350 degrees. In a food processor (or mixing bowl with mixer) puree or mix bananas until smooth. Add in Greek yogurt, pumpkin, applesauce egg and vanilla and mix well. Add in melted butter, mix well to combine. In a separate bowl, combine white whole wheat flour, oats, baking soda, cinnamon, pumpkin pie spice, salt and sugars, mixing well. Combine wet and dry ingredients, stirring until just combined. If adding nuts, mix them in as well. Pour mixture into a 13 x 9 pan that has been lined with foil and sprayed lightly with nonstick cooking spray. Bake for approximately 35-40 minutes or until lightly browned and a toothpick inserted into center comes out clean. Remove from oven and let cool for at least ten minutes. Cut and serve. Enjoy!