Sieve all the dry ingredients together and mix them well.
Mash the bananas in a bowl.
Add the powered jaggery to the mashed banana and mix well.
Crumble the butter with your fingers into the banana jaggery mix and add yoghurt. Combine well.
Mix the dry and wet ingredients together and add the slivered almonds and cashew pieces (my son hates cashews so I try to disguise them in cakes and bread).
Preheat the oven to 350 degree Fahrenheit.. Grease and flour a loaf pan.
Pour the batter into the greased loaf pan and bake for 1 hour. The baking time depends upon your oven, so keep checking in between to prevent it from burning.
The loaf is ready when a tooth pick inserted into it comes out clean. Cool the loaf before cutting and serving.
Note - Baking powder and soda can be omitted if you like, although I haven't tried it.