Preheat oven to 350 degrees. Then use part of the stick of butter to coat an 8 inch loaf pan. Set the pan aside for now.
In a large bowl, mix the sugar and softened butter together.
Add in the eggs and vanilla extract and then mix together.
Cut the bananas into small pieces and then add the bananas and the pumpkin. Mix until combined.
In a medium bowl, mix all of the remaining dry ingredients (flour, baking soda, cinnamon, nutmeg, salt) until well combined.
Slowly add the remaining dry ingredient mix to the wet mix and beat until it is smooth.
Pour the mixture into your greased bread pan and then bake for about 60 minutes. Use a toothpick to check if the bread is ready by inserting it into the center. If it comes out clean the bread is cooked all the way through.
After about 30 minutes remove the bread from the pan and then place it on a cooling rack to finish cooling completely.