Cook the mini dumplings in boiling water for 7 minutes, drain and leave to drain. In the meantime dice bacon finely. Peel and finely dice onions. Clean, clean and halve the mushrooms.
Heat the oil in a pan. Brown the bacon and onion in it. Add mushrooms and fry them, season with salt and pepper. Add stock and cream, bring to the boil and simmer for 3-4 minutes. Bind with sauce thickener, bring to the boil again.
Stir in the dumplings. Grease one large or 4 small casserole dishes. Pour everything in and sprinkle with cheese. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 15 minutes.
Wash the chives, shake dry and cut into small rolls, except for a little to garnish. Sprinkle the casserole with chives and garnish.