Clean and wash mushrooms. Carefully unscrew the stems and chop them finely. Peel shallots and cut into fine cubes.
Heat 1 tablespoon of oil in a frying pan. Fry the mushroom heads for 2-3 minutes from top and bottom. Take them out and place them in a large, flat, fireproof dish or on a baking tray. Heat 1 tablespoon of oil in the frying fat.
Fry the shallots and mushroom stems for about 4 minutes until the liquid has evaporated. Season.
Dice the ham. Grate cheese roughly. Wash parsley and shake dry. Put some leaves aside for garnishing, chop the rest finely. Mix ham, cheese, parsley and breadcrumbs into the mushroom and onion mixture.
Season to taste with salt and pepper.
Salt the inside of the mushroom heads, pour in the mixture and spread it on top. Bake in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for 10-15 minutes. Serve and garnish with remaining parsley.
Baguette goes with it.