Boil the eggs for 8 minutes so that they are hard. Leave to cool before you peel them.
Meanwhile boil the potatoes until they are soft. Peel them if you want to.
Mash the potatoes in a pot or bowl with the olive oil and milk. Season with salt and pepper.
Spread the mashed potatoes in the skillet.
Cut the eggs in half. With the help of a small knife or spoon, carefully scoop out the egg yolks. Put them in a bowl.
In that bowl mix the egg yolks with the minced meat, the onion, milk and breadcrumbs. Season with salt, pepper and mustard.
Preheat oven to 180°C (or 350 °F).
Arrange the egg halves on the mashed potatoes.
Use a spoon to stuff the eggs with the filling. Put the remaining filling around the edge.
Sprinkle the shredded cheese on top of the dish.
Put in the oven for ca. 20 minutes, until the cheese has melted and browned.