Bring a large saucepan of water to the boil. Add the tagliatelle or pasta
Meanwhile, heat the oil in wo or frying an. . Add the bacon and mushrooms until cooked five to ten minutes depending on how you want the bacon. Remove from the heat.
Beat together the soft cheese and egg in a mixing bowl, then stir in the bacon and mushrooms. Add the milk, half the cheese and the parsley (if using). Season with some pepper.
Drain the pasta, then return it to the saucepan. Add the egg mixture and heat gently for 2-3 minutes, stirring constantly, until the mixture cooks and thickens. Serve, sprinkled with the remaining cheese.