Wash the potatoes and cook them covered in water for about 20 minutes. Drain, peel and let cool down a little
Finely grate the cheese. Clean, wash and cut the chard into strips. Clean and wash the tomatoes and mushrooms. Slice potatoes, tomatoes and mushrooms
Fry the mushrooms in hot fat. Steam chard briefly. Season with salt, pepper and herbs. Place the potato and tomato slices in a greased ovenproof pan or quiche dish (Ø approx. 26 cm)
Whisk the milk, eggs and half the cheese. Season well with salt, pepper and nutmeg. Pour egg milk over the vegetables. Sprinkle the rest of the cheese on top. Let it simmer in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for about 35 minutes. Garnish if necessary