Mix cream (or Greek yoghurt), cardamom powder, sugar and mango puree in a bowl. Keep the mixture in the fridge and let it chill.
Trim the brown edges from the bread slices.
Spread the chilled cream mixture on one slice of bread.
Place four to five mango slices on top of the cream mixture.
Top with another slice of bread, refrigerate for five minutes and enjoy your mango sandwich.