Wash sage, shake dry and pluck leaves from the stems. Cut the ham slices into thirds. Peel and wash the potatoes and cut them about 2/3 deep, 3 mm apart in a fan shape.
Place 3 leaves of sage and 3 pieces of ham per potato in each of the compartments. Season with salt and pepper. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) on the greased pan of the oven lined with baking paper for 1-1 1/4 hours.
Meanwhile, grate the raclette and Comté. Mix the cream cheese, breadcrumbs and the remaining cheese and spread it on the potatoes after 30 minutes. Arrange potatoes on plates and garnish with sage.