Wash and chop the chillies. Heat a pan with a tsp of oil. Saute the chillies, garlic and cumin together until the green chillies are lightly browned.
Allow to cool and grind to a coarse paste, add water by a teaspoon if required to get the paste done. The paste would not be very smooth.
Heat a pan with oil, season with mustard seeds, Urad dal, curry leaves, add the ground masala and saute well.
Heat the Tawa and make dosas. Cook on both sides. Spread a spoon of the masala on the dosa and sprinkle oil. Fold and serve with chutneys of choice.