Finely dice the ham. Clean, wash and chop the peppers. Wash and chop the parsley. Clean the mushrooms, wash and dry them if necessary. Screw out and chop the stems
Clean and wash the leek and cut into fine rings. Peel and finely chop the onion. Heat the oil in a large pan. Sauté onion and mushroom stems in it. Steam the leek briefly. Deglaze with 3/8 l water and stir in the stock. Bring to the boil and simmer for about 5 minutes
Mix cream cheese, ham, paprika, parsley and egg yolk, season. Season mushrooms inside and fill with 1 tablespoon of cheese mixture each
Stir the rest of the cheese mixture into the leek, season. Fill leek into a large greased baking dish, place mushrooms on top. Bake in a preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for approx. 20 minutes until golden brown. Arrange and garnish with parsley if desired. Serve with mashed potatoes or rice