This is very quick and easy.
Cook the pasta. While it's cooking, chop the garlic finely. Drain the pasta. In the pasta pan, heat a very small amount of oil or butter, and cook the garlic for a minute or less - just long enough to remove the raw taste. Add the drained pasta, the cream and the parmesan, and stir it all up over a low heat for one minute. Add salt and pepper to taste.