Preheat the oven to 180°C (350°F).
Grease and line the loaf pan with parchment paper.
Melt the butter and mix the yogurt with the vinegar or lemon juice. If you’re using buttermilk, the vinegar is not necessary.
Mash the bananas with a fork.
Whisk the sugar and eggs together until just combined (there's no need to double in volume); whisk only until the mixture becomes pale.
Add the melted butter (or oil) and mix. Then, add the yogurt, salt, cinnamon, and mashed bananas. Mix well to combine
Then, gently fold in the sifted flour and baking powder. Mix lightly without overbeating. Add the chopped nuts and fold in using a spatula.
Pour the batter into the loaf pan and smooth the top. If you want to decorate with banana, cut a banana lengthwise and place the two slices, cut side down, on top of the batter.
Bake for about 55 minutes until a toothpick inserted into the banana bread comes out clean.
Remove from the pan and place on a wire rack to cool completely.
I hope you'll enjoy this easy recipe for the famous moist banana bread and feel inspired to give it a try.