Wrap potato in foil. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 1 1/2 hours, remove from oven
Mix quark, cream cheese and horseradish. Cut cress from the bed. Set aside some cress for sprinkling. Stir the remaining cress into the quark cream, season with salt and pepper
Fry the diced ham in a coated pan without fat for 2-3 minutes until crispy. Take out and drain on kitchen paper. Remove the potato from the foil and break open in the middle. Arrange potatoes with quark cream, sprinkle with ham cubes and cress