Heat the butter and olive oil together in a large pot over medium heat until melted.
Add the minced garlic and cook gently until fragrant and lightly golden.
Season with salt, black pepper, red chili flakes, and Italian seasoning, stirring to combine.
Pour in the vegetable broth or water and bring the mixture to a gentle simmer.
Add the pasta, pressing it down so it is mostly submerged, and cook uncovered while stirring occasionally.
When the pasta is nearly tender, reduce the heat and stir in the heavy cream.
Continue cooking until the sauce thickens and the pasta is fully cooked.
Add the Parmesan cheese and stir until melted and smooth.
Remove from heat, let rest briefly, and garnish with fresh parsley before serving.
