Wash the plums and remove the pits. Dice the flesh. Sprinkle with ground cinnamon and, if not sweet enough, a little xylitol. Set aside.
Pour the flour into a large mixing bowl. Add the xylitol and a pinch of salt. Mix well. Set aside.
Take two mixing bowls and separate the eggs into them. Put the yolks in one bowl and the whites in another.
Add the cooking cream and milk to the egg yolks. Mix thoroughly, then pour into the flour mixture. Mix until smooth.
Beat the egg whites until stiff, then fold them into the mixture.
Bake the mixture in two batches, as this will make it easier to turn and will also make it crispier.
Heat half of the butter in a large frying pan and spread it evenly. Pour in half of the batter. Cook for a few minutes (without stirring or shaking). When you see that the edges are golden brown, flip it over with a wooden spoon, as if you were flipping a pancake. Use the wooden spoon to tear the baked dough into pieces. Add the prepared plums and a little plum jam to improve the flavor. Bake for another minute, then turn out onto a plate.
Bake the other half of the dough as well.
Serve lukewarm with plum jam.