Knead the flour, butter, powdered sugar, egg yolk and salt.
Roll out the dough to a diameter of 30 cm, place in a tart pan (24 cm diameter), pull up the edge. Prick the dough base several times and put it in a very cold place for 15 minutes. Cover with baking paper and peas.
Pre-bake in a hot oven at 200 ° C on the 2nd rack from the bottom for 12 minutes. Remove the paper and peas.
Halve the quinces and cut across into 4 slices each, peel and remove the core.
Caramelize the sugar in a large pot or pan and melt the butter in it.
Simmer the quinces in it on each side for 5 minutes, remove with a slotted spoon and place on the dough.
Bring the cream with the rest of the caramel to the boil and pour through a sieve. Whisk with eggs and yolks and pour over the quinces.
Bake at 200 ° C on the 2nd rack from the bottom for 25-30 minutes. Serve warm, dusted with powdered sugar.