Pick the ham into pieces. Grate Appenzeller. Chop Sbrinz into shavings. Wash the chives, dab dry and cut into small rolls. Peel and chop the onion. Cook the pasta in 3-4 l boiling salted water (approx. 1 tsp. salt per litre) according to the instructions on the packet.
Heat 2 tablespoons of butter in a saucepan, dust with flour and sauté lightly. Deglaze with 1/2 l water and cream, bring to the boil and stir in stock. Simmer while stirring for 3-4 minutes, then melt the Appenzeller in the sauce.
Season to taste with salt and pepper. Stir in ham and chives.
Crumble bread. Melt 1 tablespoon of butter in a frying pan. Fry the onion and breadcrumbs in it until golden brown.
Take off about 100 ml of pasta water. Drain noodles and mix with Appenzeller sauce. Dilute with pasta water if necessary. Serve the noodles with crumb mix and Sbrinz. Serve with a green salad.