1) Use a large pot of boiling salted water to cook fettuccine for 6 to 8 minutes just until al dente.
2) Remove from heat. Drain excess water and return to dry pot.
3) In a large, heavy skillet, melt butter and cream over medium-low heat. Cook until the mixture bubbles. Cook and stir couple of minutes more.
4) Season with salt, pepper and nutmeg.
5) Remove from heat.
6) Slowly add cheese to blend thoroughly and smoothly.
7) Return back to heat for few seconds to blend the cheese completely if necessary. (Do not let sauce bubble or cheese will become lumpy and tough.)
8) Spread the sauce on top of the fettuccine in pot. Stir and toss well over low heat for 2 to 3 minutes until sauce is thickened and fettuccine is evenly coated.
9) Sprinkle with chopped parsley just before serving.