Set oven to 350 degrees F. Line the bottom of a loaf pan with parchment paper.
Make filling first and set aside. Mix all ingredients together in a bowl until smooth and creamy.
Sift together the flour, baking soda, cinnamon and salt. Beat sugar and eggs with a whisk until light and fluffy, about 10 minutes. Drizzle in oil. Add mashed bananas, sour cream, and vanilla. Fold in dry ingredients and nuts.
Pour half of the batter into pan. Spoon filling over batter. Top with remaining batter.
Pour into a lined loaf pan and bake for about 45 minutes to 1 hour.
Notes
Baking time could be as long as 60 minutes
Banana Bread recipe modified from Flour - by Joanna Chang
Recipe by Recipes Food and Cooking at https://recipesfoodandcooking.com/2013/04/15/banana-cream-cheese-bread/