In a large skillet or pot, add the pasta, chicken broth, butter, garlic, and red pepper flakes.
Bring to a boil over medium-high heat and cook, stirring often, until the pasta is tender and the liquid has mostly absorbed, about 10-12 minutes.
Reduce heat to low, stir in the Parmesan cheese until creamy and smooth.
Season with salt and pepper to taste.
Garnish with fresh parsley and serve warm.