Bring the milk to the boil with butter, salt and nutmeg, sprinkle in the semolina and cook over a low flame for 15-20 minutes, stirring constantly.
Remove from the heat, fold in the parmesan and the egg yolks, whisked with a little milk.
Pour the mixture onto a work surface that has been moistened with water, smooth it out with a spatula dipped in water, it should be about a finger thick.
Cut out slices with a glass and place them in layers in a greased baking dish, sprinkle each layer with parmesan and baste with butter.
Place the gnocchi in the preheated oven and bake for about 1/2 hour at 200 ° until golden brown until a crust has formed.