In a bowl take all purpose flour,Salt and ghee .add sufficient water and make a firm dough. Keep aside covered with wet muslin cloth for 5minutes.
Heat oil in a pan. Add cumin seed. When its crackle add onion add ginger-green chilly paste. Now add mashed potatoes and saute for 2 minutes. Add all dry spices and mix everything well. Saute For another 1 minute. Cool completely
Divide the dough into equal portion. Take one portion and roll it into an oval shape chapaati. Divide it into 2 halves. Make a cone from each half.
Stuff each cone with 1 tbsp of the potatoes stuffing. Seal the edges carefully using a little water.
Make all samosa like this. Arrange them on a greased baking tray. Bake in a pre heated oven at 180 degree c for 15 minutes. Turn them over and again bake for 15 minutes.
Serve immediately with tomato sauce.