Cut cucumber, tomato and boiled potato into thin slices. Now sprinkle and mix chat masala and pepper powders and salt.
Spread butter on to the each of the bread slices.
Spread some of the green chutney on a buttered bread slice and then spread the cucumber, potato and tomato mixture.
Take another bread slice and sprinkle grated cheese. Place this bread slice on the bottom of the bread slice with the cucumber and tomato mixture. Finally cover with another bread that has some green chutney spread on to it.
Now cut into 4 triangular pieces. Serve with ketchup.