In a large pot of boiling salted water cook the fettuccine al dente.
In a medium pan add ½ the butter, ¼ cup Parmesan cheese and approximately 3-5 tablespoons of hot pasta water. On low medium heat, whisk together to make a cream.
Add the drained pasta, another 3-5 tablespoons of hot pasta water or a little more if needed, the remaining butter and parmesan cheese, gently toss together on low heat (for about 1 minute) and serve immediately, sprinkle with parmesan cheese and black pepper. Enjoy!