Clean, wash and halve the mushrooms. Peel and finely chop the onions. Cut the bacon into small cubes as well. Skip the bacon and take it out. Melt the fat in the bacon fat. Fry onions and mushrooms for about ten minutes, turning them over.
Season with salt and pepper. Dust with flour. Stir until golden brown and deglaze with cream and stock. Let it boil again for about five minutes. Wash the chives and cut into small rolls.
Add bacon and chives to the soup. Season again and serve. Serve with fresh baguette.