Mash the banana well. Add yogurt, sugar, ghee, salt, baking soda, cumin seeds and beat well until they become mushy and mixed well.
Now add little by little the flour (wheat or maida) and make a dough you do for puri. NOTE: avoid adding water as much as possible if you still need water add as needed. Coat the dough with little oil and keep it aside for 8 hours.
Now make equal size balls and make a thick flat dough round sheet like you do for puri.
Heat oil in a pan and fry them in low heat and serve. NOTE: don't cook in very high heat it will get burnt. Inner side should be like cotton.
Dough has to be make like you do for puri or the result won't be good.
Trick is to cook in low heat until the middle is cooked or it will be mushy.