Take a pan add oil to it, now add asafoetida powder to it, now add urad dal and chana dal to it,

Now add green chillies, ginger and garlic finely chopped to it, now add turmeric powder to it, now add salt to it,

Now add boiled and mashed potatoes to it, now mix it well and off the flame and make the mixture cool, now make the round balls from it,

Now take a bowl and add besan flour to it, now add asafoetida powder, kashmiri red chilli powder, turmeric powder and salt to taste to it, now add add water as required to it,

Now mix the besan mixture well and give rest for 5 mins, now add baking soda to it and mix well, now dip potato balls into it and coat it well,

Now deep fry the vadas and make it golden brown from both the sides, now our Mumbai Magic Vadas are ready to serve, take it to the serving plate and serve hot with green chutney.