Preheat oven to 325 degrees
Mash bananas in mixing bowl.
Add vanilla, eggs, brown sugar, yogurt, and oil to the bananas. Cream together.
Put flour, salt and soda in a sifter or mix in a bowl. Add cinnamon if you are using it.
Mix dry ingredients into creamed mixture. Mix slowly only until combined.
Pour into greased or parchment paper lined bread pans.
Sprinkle tops of loaves with cinnamon and sugar.
Bake 40-45 minutes,