Wash and peel the potatoes, then boil in a pot until tender.

Drain the water and mash the potatoes well with a potato masher.

Add the butter and mash again.

Pour in the beaten egg, add nutmeg and salt to taste, and mix.

Preheat the oven to 200°C. Transfer the mash to a piping bag fitted with a star tip and pipe swirls onto a baking tray.

Brown the potatoes for 10-15 minutes and serve right away.