Bring a large pot of salted water to a boil and cook the pasta according to package directions until al dente.
Reserve 120ml of the pasta cooking water before draining the noodles.
In a large skillet, melt the butter over medium-low heat.
Add the minced garlic and red pepper flakes to the skillet and sauté for 1 to 2 minutes until fragrant and softened, ensuring the garlic does not brown.
Add the cooked pasta and reserved pasta water to the skillet.
Toss the mixture vigorously over medium heat until the liquid emulsifies with the butter to coat the pasta.
Remove from heat and stir in the chopped parsley and grated Parmesan cheese.
Adjust seasoning with salt and black pepper before serving immediately.