Peel onion and parsley roots. Finely dice the onion and parsley roots. Peel, wash and dice the potatoes. Wash parsley, dab dry and pluck leaves from the stalks. Coarsely chop the leaves, except for a few for garnishing.
Heat clarified butter in a wide pot. Sauté onion and parsley root for 2-3 minutes. Add potatoes and parsley, deglaze with broth. Let simmer for 10-12 minutes. Meanwhile grate cheese coarsely and whisk with egg. Cut baguette into 8 slices. Spread the cheese mixture on top. Place the slices of bread on a baking tray lined with baking paper. Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 10 minutes. In the meantime puree the soup.
Cut baguette into 8 slices. Spread the cheese mixture on top. Place the slices of bread on a baking tray lined with baking paper. Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 10 minutes. In the meantime puree the soup. Stir in crème fraiche. Arrange soup and bread and garnish with parsley