Place puff pastry slices next to each other on the work surface and allow to defrost. Clean, wash and chop the mushrooms. Peel and finely chop the onion. Fry both in hot fat.
Cut the ham into thin strips. Wash parsley, dab dry and chop. Add ham and parsley to the mushrooms. Stir in cheese. Season with salt and pepper. Separate the egg. Whisk egg yolk and cream.
Cut the puff pastry slices in half crosswise to make two squares each. Cut out flowers or similar from six squares with a cookie cutter. Brush the edges of the whole squares with egg white, place puff pastry slices with cut flowers on them and press them down at the edges.
Add some filling to the cut out circle. Spread the puff pastry cushions and the cut out flowers with whisked egg yolk and place them on a baking tray lined with baking paper. Bake in a preheated oven (electric: 200 °C/ gas: level 3) for 20 minutes.
Remove cut flowers after 12 to 15 minutes. Results in six pieces.