In a mixing bowl with the whip attachment, whip the heavy whipping cream and icing sugar until medium stiff peaks form. Gently fold in the mango purée using a rubber spatula. Taste and add more powdered sugar if necessary.
Using small ramekins or jars, spoon the mango mousse halfway, add 3-4 teaspoons of lightly chopped mangoes, and top with more mango mixture until the jar is filled.