Preheat the oven to 350 0F and prepare the loaf pan by greasing and dusting with flour.
Peel the bananas and mash well with a fork. Switch to a hand mixer or stand mixer and beat the bananas well. More ripe the bananas are, the better the bread will be.
Measure sugar and add to the beaten bananas and beat them together for 2-3 minutes.
Add the measured oil to the mixture and beat until well combined.
Now add the yogurt and beat well.
Add your choice of vanilla favoring. I am using pure vanilla extract here.
In another bowl, mix all the dry ingredients. Start by adding all-purpose flour and whole wheat flour. Then add a measured quantity of salt, baking powder, baking soda, Cinnamon, and nutmeg.
Now mix all the dry ingredients thoroughly. ( You can also sift the flour and all the dry ingredients if have lumps in your baking powder or something else).
Add dry ingredients into the wet ingredients and mix well.
Add and mix blueberries into the mixture.
Pour the batter into the loaf pan.
Top with the chopped walnuts.
Bake for 50-55 minutes or until the toothpick inserted in the center of the loaf comes out clean.
Let it cool in the pan for 10 minutes and then take out on to a cooling rack. Leave on the rack until fully cooled.
Serve with your favorite icing and refrigerate the remaining.