Cut the rolls into cubes and toast them with the butter until golden. Mix the flour with the baking powder and mix with the eggs, milk and salt to form a smooth dough. Fold in the toasted bread cubes,
Bring a large saucepan of water to the boil, season with salt.
With a spoon, which is always immersed in hot water, cut off the dumplings and add them to the boiling water.