Beat the egg, sugar and butter alternating milk, flour, baking powder and cinnamon. Make a soft dough. Take a small portion of dough and stretch it on the palm of your hand and wrap each plum with it. Put it in a extended pyrex and put it in the oven until half cooked.
Prepare the beating
Beat white egg until they are hard with the sugar and add the yolk, cinnamon, flour and milk. Pour on a pyrex the plums bundles. Put it in the oven until it is golden. Serve them hot or cold.