01 - Bring a large pot of salted water to a boil. Cook pasta according to package directions until al dente. Reserve 1/2 cup of pasta cooking water and drain the pasta.
02 - Melt butter in a large skillet over medium heat. Add minced garlic and sauté for 1 to 2 minutes until fragrant without browning.
03 - Pour in heavy cream and bring to a gentle simmer. Cook for 2 to 3 minutes, stirring occasionally.
04 - Add grated Parmesan, salt, black pepper, and red pepper flakes if desired. Stir until cheese melts and sauce is smooth.
05 - Add drained pasta to the skillet and toss to evenly coat with sauce. Adjust thickness by adding reserved pasta water gradually if needed.
06 - Remove from heat and stir in most of the chopped parsley, reserving some for garnish.
07 - Plate immediately, topped with extra parsley and additional grated Parmesan cheese.