Heat oil in a pan. Add the mustard seeds, urad dal, fennel, dry chilly, curry leaves and let it sizzle.
Add the chopped garlic and saute for a min.
Add the chopped onions and saute till onion turns soft about 2 mins.
Add the boiled potatoes and with your spatula break the potatoes into small pieces and partly mashed it.
Add salt, turmeric powder, chilly powder, mix well and saute for a min or two.
Add in garam masala powder, gram flour, mix well and saute for about for 5 mins.
Add chopped coriander leaves, give a quick stir and take off the heat.