Arrange paneer, onion, cucumber, tomato, capsicum slices on four bread slices. Sprinkle salt and chaat masala over them. Top with a cheese slice. Apply one tablespoon green chutney on each of the remaining four slices. Top it with one tablespoon of tomato ketchup.
Place these slices over the cheese slices with the chutnied side facing down. Press lightly. Place the sandwich on the grill and grill till both sides are golden and have the grill marks. Serve hot.