1. Preheat oven to 350 degrees. Grease two full sized loaf pans. ( Mine says 9 1/4 x 5 1/4 x 2)2. In a large bowl, cream butter and sugar. Add in the eggs, mashed bananas, sour cream, vanilla and cinnamon and combine.3. Mix in salt, baking soda, and flour just until combined. Mix in nutella.4.Divide batter into prepared pans and bake for 35-45minutes, until a toothpick inserted in center comes out clean.