Mix pudding powder with 75 g sugar and stir with 100 ml milk until smooth. Boil 300 ml milk in a pot. Stir the pudding powder into the boiling milk, bring to the boil and simmer for about 1 minute.
Take it off the stove. Stir in the mascarpone. Pour into a bowl, cover directly on the surface with foil and allow to cool.
Wash, halve and stone the plums. Caramelise 125 g sugar in a pan until golden brown. Add the plums and simmer over medium heat for about 5-7 minutes, turning several times.
Remove from the stove and let it cool down.
Stir the pudding until smooth. Lay the plums, pudding cream and crunchy flakes alternately in a glass bowl. Keep cool until serving.