01 - Bring a large pot of salted water to a boil. Cook the fettuccine according to package instructions until al dente. Reserve 1/2 cup of pasta water, then drain the pasta.
02 - Melt the butter in a large skillet over medium heat. Add minced garlic and sauté until fragrant, about 1 minute.
03 - Pour in the heavy cream and bring to a gentle simmer. Cook, stirring frequently, for 2 to 3 minutes until slightly thickened.
04 - Reduce heat to low. Add grated Parmesan cheese, salt, pepper, and nutmeg if using. Stir until the cheese melts and the sauce is smooth.
05 - Add the drained fettuccine to the skillet and toss to coat evenly with the sauce. Add reserved pasta water gradually to adjust sauce consistency as needed.
06 - Plate immediately, garnished with chopped parsley and additional Parmesan if desired.