01 - Bring a large pot of salted water to a boil. Add the pasta and cook until al dente. Reserve 1/2 cup pasta water, then drain.
02 - Heat butter and olive oil in a large skillet over medium heat. Add minced garlic and sauté for 1-2 minutes until fragrant but not browned.
03 - Pour in heavy cream, stirring to combine. Simmer gently for 3-4 minutes, allowing the sauce to thicken slightly.
04 - Add Parmesan cheese, black pepper, salt, and red pepper flakes. Stir until cheese melts and sauce is smooth.
05 - Add drained pasta to the skillet. Toss to coat, adding reserved pasta water as needed to reach preferred consistency.
06 - Stir in most of the chopped parsley. Taste and adjust seasoning as needed.
07 - Serve immediately, topped with extra Parmesan and remaining parsley.