Preheat oven to 325F. Prepare a 9 x 5 inch loaf pan.
Sift together the flour, baking soda, cinnamon and salt into a bowl.
In a separate bowl, whisk the eggs and sugar until light and fluffy. Slowly drizzle in the oil. Add the bananas, crème fraîche/sour cream and vanilla and mix until just combined. Fold in the flour mixture and nuts until thoroughly combined.
Transfer batter into the pan and bake for 1 to 1 1/4 hours. Let cool in the pan for at least 30 minutes before removing the cake from the pan to finish cooling.