Finely grate the peeled potatoes and onions. Knead with the eggs, flour and 3/4 of the ham cubes. Season with salt and pepper.
Place the potato mixture on an oiled baking sheet (approx. 35 x 40 cm) and distribute it evenly. Bake in a preheated oven at 200 ° / convection 175 ° for approx. 30 minutes until golden brown. Cut into about 20 pieces.
Fry the remaining cubes of ham until crispy without fat.
Stir the creme fraiche or sour cream until smooth and place in dots on the potato pancakes. Sprinkle with diced ham and parsley.