1. You may cook the fettuccine noodles according to package directions in a big pot of boiling salted water.
2. Drain and save roughly 1 cup of the fettuccine noodle water.
3. Meanwhile, you can melt the butter and cream in a large skillet over medium heat.
4. You can keep cooking until the butter has melted and the cream has started to bubble.
5. Then season with salt and pepper after whisking in the Parmesan.
6. You can allow 1 to 2 minutes for the sauce to thicken slightly. The sauce will be thin at first, but it will thicken as it cools and fettuccine noodles are added.
7. You can now toss in the cooked fettuccine noodles until it is well coated in the sauce.
8. If the sauce is too thick, you can add 1 spoonful of the leftover fettuccine noodle water at a time.
9. You can serve the dish immediately and enjoy it with a parsley or basil garnish.

You can watch this video recipe to see how to cook fettuccine noodles.