Sift the flour and mix well with the milk, vanilla sugar, egg yolks and salt with a whisk. Then beat the egg whites with 2 tablespoons of granulated sugar as stiff as possible and carefully fold into the dough.
Heat the butter in an ovenproof pan, if possible with a coated pan. Spread 1 tablespoon of sugar in the pan, let it melt briefly in the butter and pour in the egg mixture. Scatter the pears, peeled and cut into small cubes.
Bake in the preheated oven at 150 ° C (convection) on the middle rack for about 15 minutes. Take out of the oven, cut in half and turn the halves.
Carefully tear into small pieces with two spoons on the stove while continuing to fry over low heat. Place on a platter and sprinkle with powdered sugar, serve with cranberries.