04After the pasta has been drained, return it to the pot and pour in the cheese sauce, dried chopped onion, parsley flakes, and 1/2 cup of the shredded parmesan. Stir, coating the pasta well; then put the mixture into a 13 x 9 baking dish. Sprinkle the top with the remaining parmesan and bake for 45 minutes to an hour. Serve with rolls or a salad.