Cut the chard to the size of the pasta plates. Let the leaves collapse in salt water. Take out the leaves and place on kitchen paper. Cut the ham into strips, dice the mozzarella.
Melt the butter, stir in the flour, add the milk and cream, stir until a thick sauce is formed, simmer for 5 minutes, season with nutmeg, salt and pepper. Grease a rectangular shape with 1 tablespoon butter, add a little sauce, then a pasta sheet, then a chard leaf. Sprinkle with pepper and nutmeg. Add ham and cheese. Layers until all ingredients are used up. Finally, pour the rest of the sauce and cheese cubes over the top. Bake on the middle rack in the oven (electric stove: 160 ° / fan oven: 140 °) for approx. 30 minutes.