Preheat oven to 350 F. Butter and flour a standard size, 9×4 inch, loaf pan.
In a large bowl, add the eggs and sugar and whisk until light and airy. Add the oil or butter while whisking, then the spices and salt.
Mash the bananas with a fork then add the mashed bananas and pumpkin puree to the bowl and whisk well.
Whisk in the flour and baking soda then whisk in the buttermilk until you have a smooth batter. There will be lumps of banana, this is fine.
If you like, you can add a thin, long slice of banana to the top.
Bake until the top springs back, a cake tester inserted into the middle comes out clean, about 50-60 minutes.
Cool for 5 in the pan and then remove and set on a cooling rack. The bread is best the next day.