Sauté finely chopped onion and then add the chopped bacon until browned. Cut mushrooms into chunks and cook them in butter. Cook the pasta in boiling water as previously dissolved broth (of your choice, I did it with beef). All mix in a baking dish and if necessary add salt. Add the cream (amount to taste). Grate the cheese and the feta cheese and sprinkle thickly with them. Bake at 200C fan or upper burning until browned. Sprinkle lightly with thyme finished dish.