Heat a pan with 1 tbsp of oil. Add cumin seeds, mustard seeds, curry leaves, and grated ginger. Saute for a minute.
Add chopped onions and green chillies. Saute until the onions turn translucent.
Add chopped tomatoes and cook until they turn soft.
Add the boiled and mashed potatoes, salt, and coriander leaves. Mix well and cook for 2-3 minutes. Turn off the flame.
Heat a tawa or griddle over medium heat. Spread a ladle full of dosa batter in a circular motion to form a thin layer.
Spread some schezwan sauce on top of the dosa.
Place a spoonful of the potato mixture on one side of the dosa and fold it.
Cook the dosa for 1-2 minutes on both sides until it turns golden brown.
Serve hot with coconut chutney or sambar.