Preheat oven to 350°F. Coat a large bread/loaf pan(mine is 9×5) with non-stick spray or grease it with butter or oil. Set aside.
In a large bowl combine the brown sugar, butter and banana. Whisk until well combined.
Add in the eggs one at a time , vanilla extract, yogurt and whisk together.
Sift the flour, baking soda and salt over the wet ingredients and fold in using a spatula until evenly combined. Do not over mix. Add little over half of the chopped walnuts.
Pour into prepared loaf pan and top with chopped walnuts and/or split banana(optional).
Bake for 40-45 minutes (until toothpick inserted in center comes out clean).
Remove from oven and allow the bread to cool completely. Slice and enjoy!