Take a big bowl and add potatoes and mashed.. and add green mint chutney..

And add salt and sandwich masala.

Take a one bread slice and spread butter..

And then take 2 slice and spread potatoes mixture..

And again take last brad slice and add tomatoes slices and sprinkle chaat masala.

And one by one makes sandwich layers.

And prepared.. and toasting with butter and served with sauce, chutney or ketch up..