To the mashed bananas in a bowl, add the melted butter, and mix it thoroughly.
Add in the jaggery powder and mix again.
Add yogurt and vanilla extract and mix once again.
Using a sieve, sift wheat flour, baking soda, salt and ground cinnamon, and add to the wet ingredients mixture. Whisk till all ingredients are mixed.
Grease a 9" x 5" loaf pan with some butter and dust with whole wheat flour. Preheat oven to 350 degree F or 180 degree C. Add in the banana bread batter to the greased pan.
Bake in the preheated oven for around 50 minutes to one hour till the cake is done (when the inserted toothpick comes out clean).
Remove the cake from the oven and allow it to cool before slicing and serving.
The Eggless Banana Cake is ready to be relished. Serve it warm or store the banana bread in the refrigerator and use within a week.