Pre-heat oven to 350° F. Line a 8” x 4” loaf pan with parchment paper or grease with non-stick cooking spray.
Whisk together flour, sugar, baking powder, baking soda, and salt in a medium mixing bowl.
In a separate bowl, stir together mashed banana, sour cream, egg, vanilla and butter.
Pour the wet ingredients over the dry ingredients and fold the ingredients until all the flour has been incorporated and a shaggy, wet batter is formed.
Gently stir in the cranberries and chopped pecans.
Scrape the batter into the prepared pan and evenly spread all batter into the corners and around sides.
Sprinkle oats over the top and bake for 60 minutes. When finished, the loaf should be domed and golden, and a toothpick inserted into the center should come out clean.
Let the loaf cool in the pan for 15 minutes before removing and slicing. Serve with NUTELLA® hazelnut spread on each slice.