Masala dosa is stuffed dosa. The two parts are the dosa and the stuffing. The dosa is made in the usual way by soaking rice and lentils overnight in water and then grinding it to a batter. The stuffing is made from boiled potatoes with a seasoning of mustard seeds and garnishing of grated coconut, coriander, and lemon juice.
Mysore masala dosa has a red chutney made from red chillies, onion, and garlic applied to the inside of the dosa before placing the potato stuffing on top of it.