Make the mint chutney. Recipe here.
Slice the potatoes, tomatoes and cucumbers. Sprinkle with salt.
Slather the bread with butter and follow with a layer of the mint chutney. Add slices of potatoes, tomatoes and cucumbers, add the grated cheese and sprinkle with chaat masala.
Finish with another slice of bread and grill in either a preheated skillet or a sandwich toaster. It's ready to serve!