Cook the potatoes à l'anglaise.
Once cooked, pass them in the press-purée.
Add the 2 egg yolks butter, the Swiss cheese and the hot milk.
Beat the eggs firm.
Delicately add the firm egg whites to the potato mixture.
Pour in a buttered soufflé pan.
Bake in hot oven, 180°C for 20 minutes.
When finished, serve immediately.