Clean the mushrooms, wash if necessary and cut into slices. Peel and finely chop the onion. Heat 30 g butter in a pot and fry the onion in it. Add the mushrooms and fry for about 5 minutes. Season with salt and pepper. Dust with flour and sauté. While stirring, deglaze with stock and cream and bring to the boil.
Add processed cheese and melt in it. Season with salt and pepper. Wash parsley, dab dry, pluck leaves from the stems and add to the soup. Cut off the edges of the bread. Cut bread into triangles. Heat the remaining butter in a pan and fry the bread in it until golden brown. Arrange the soup in small bowls, garnish with parsley if necessary and serve together with the roasted chunks