Cut bread slices into roundels with a large round cookie cutter. Cut the center of half the bread roundels with a small heart shape cookie cutter.
Heat a non-stick tawa.
Apply some butter on one side of bread roundels and heart centered roundels and place them on hot tawa with butter side downwards and toast till golden brown. Transfer onto the worktop.
Grate dark chocolate on a plate and grate processed cheese in a bowl.
Spread some grated cheese and grated chocolate on the toasted side of bread roundels and cover with heart centered roundels.
Place the sandwiches on the hot tawa, cover and toast till the chocolate and cheese melt and the underside of the sandwiches turn golden.
Arrange them on a serving platter and serve hot garnished with some grated chocolate and cheese.