01 - Bring a large pot of salted water to a rolling boil. Add the fettuccine and cook according to package directions until al dente. Reserve 1/2 cup of pasta cooking water before draining thoroughly.
02 - While pasta cooks, melt butter in a large skillet over medium heat. Add minced garlic and sauté for 1–2 minutes until fragrant and lightly golden, taking care not to burn.
03 - Pour heavy cream and milk into the skillet, stirring constantly to incorporate. Bring to a gentle simmer and cook for 3–4 minutes until the sauce begins to thicken slightly.
04 - Stir in grated Parmesan, black pepper, salt, and red pepper flakes if using. Continue simmering until cheese melts completely and sauce becomes smooth and velvety.
05 - Transfer drained pasta to the skillet. Toss thoroughly to coat every strand with sauce. Add reserved pasta water as needed to achieve desired consistency.
06 - Fold in chopped parsley and basil until evenly distributed. Serve immediately while hot, topped with additional grated Parmesan and fresh herbs.