Heat oil in a pan. Add cumin and asafetida in it. Then mash the potatoes and add. Then add all the spices and salt, and mix well. and turn off the gas. Potato masala is ready.

Take a bread, apply tomato sauce on it. Then put potato masala on top of it with chaat masala and sev. Apply tomato sauce on the second bread. Then place it on top of the potato masala.

Heat the tawa. Apply butter on the bread, and bake it well from both the sides.

Potato Masala Sandwich is ready.