Using your stand mixer fitted with the flat beater attachment, combine the butter and sugar until well combined. Add the eggs, one at a time, mixing well after each addition and scraping the bowl as needed. Add the pumpkin, mashed bananas and vanilla extract and mix well at medium speed. In a separate medium sized mixing bowl, combine the flour, baking soda, salt, baking powder, cinnamon, ginger, nutmeg and the ground cloves. Slowly pour the dry ingredients into the wet ingredients over low speed until well combined. Add in the walnut/pecans if using and mix well.