Make onion potato dry curry as instructed in the linked recipe. Make spicy green chutney or avocado chutney as instructed in the linked recipe.
Spread butter on all sandwich breads.
Spread green chutney or avocado chutney on all sandwich breads on top of butter layer.
Place sliced cheese on 4 sandwich breads on top of chutney layer.
Place some onion potato dry curry/kanda bataka shaak on 4 sandwich bread on top of cheese layer. Sprinkle finely chopped/sliced onions on top of onion potato dry curry/kanda bataka shaak layer.
Drizzle sriracha sauce on top of onions layer.
Sprinkle some Jiradu/Chaat Masala/Sandwich Masala on top of onions layer.
Place sliced cheese on top of loaded sandwich bread, on top of sriracha layer.
Stack other sandwich bread (on that is coated with butter and chutney), chutney side facing the filling of the sandwich.
Put some pressure on the stacked sandwich with palm of your hand to push all the layers down a little.
Spread butter on both side of the sandwich.
Toast it using any sandwich maker until it gets golden and crispy on both sides!
If you do not have a sandwich maker, you can use tawa to toast the sandwich putting some pressure on top with spatula. Do it on both sides of the sandwich.
Serve it hot with extra chutney, tomato ketchup and crunchy potato chips!!