Step by step

Grate a little gruyere cheese and add to the gratin, then bake in a pre-heated oven at 200°C until browned

Tips
Don’t forget to grease your pastry cutter, thus avoiding the possibility of the dough sticking to it after each cut.
Trivia
According to many lovers of Italian food, Roman-style gnocchi isn’t a dish from Lazio, but is from Piedmont: which is correct? Who knows