Cook the spaetzle in boiling salted water for about 10 minutes. Clean and wash peppers, leek and mushrooms. Cut mushrooms into slices, leek into rings and peppers into strips. Wash meat if necessary, dab dry and cut into cubes. Wash and chop the herbs.
Drain spaetzle. Heat the oil in a large (preferably ovenproof) pan. Brown the meat in it while turning it. Season with salt and pepper and remove. Fry the vegetables in the frying fat for approx. 5 minutes, turning them over. Deglaze with cream and 1/4 litre water, stir in stock and bring to the boil. Thicken sauce stock and season to taste. Add spaetzle, meat and herbs. Grate cheese over the pan.
Deglaze with cream and 1/4 litre water, stir in stock and bring to the boil. Thicken sauce stock and season to taste. Add spaetzle, meat and herbs. Grate cheese over the pan. Bake in the preheated oven on the highest setting for approx. 5 minutes or grill over. Or simply stir in the cheese and let it melt