Soak the buns. Cut the top off each pepper. Clean and wash the peppers. Clean, wash and slice the mushrooms. Peel and chop the onion.
Heat 1-2 tablespoons of oil. Fry the mushrooms in it, season. Take them out. Wash the thyme and pluck off all but a little bit of it.
Squeeze the buns. Knead with onion, meat, egg, mushrooms and thyme. Fill the bell peppers with it. Heat 1 tablespoon of oil. Brown the bell peppers on the cut surface. Grate cheese
Place the peppers in an ovenproof dish without the lids. Pour on the stock. Bake in a hot oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for 50-60 minutes. After half of the cooking time, place the paprika lids on the peppers. Finish roasting
Remove the peppers and keep warm. Measure out a good 1/4 l stock. Heat the fat. Sprinkle with flour and sweat. Stir in stock and milk. Bring to the boil and simmer for about 5 minutes. Melt cheese while stirring. Flavour sauce. Serve everything. Sprinkle with rest of thyme. Serve with: mashed potatoes or rice