Using a blender, blend all the ingredients (except the liqueur) until you obtain a creamy mixture.
Pour into individual dessert cups and bring them to the freezer for around 20 minutes.
If you want, pour a dash or two of Cassis liqueur on the Mango Cream before serving. Or just serve with the liqueur on the side so your guests can pour themselves!
Notes
For a healthier version, substitute the vanilla ice cream for frozen yogurt!