Boil potatoes. Transfer to a bowl and mash them. You can also grate them.

To that, add chilly powder, cumin powder, turmeric, and garam masala.

Then add onion powder, mixed herbs, dried parsley

Now add chaat masala, amchur powder, and sandwich masala (if adding).

Next add minced green chillies, ginger-garlic paste, and chopped cilantro.

Mix it all. Taste and add salt if needed.

Cut the edges of the bread slices. Make breadcrumbs out of those discarded edges and store them.

Spread vegan butter on every slice.

Smear one bread with green chutney and smear the other bread slice with tomato ketchup.

Layer the bread slice which has green chutney with a generous amount of spiced potato filling. Add grated cheese on top if adding.

Close with the tomato ketchup side of the bread slice.