Parmesan Garlic Spaghetti
1/2 cup freshly grated Parmesan cheese. 8 ounces spaghetti 10 tablespoons unsalted butter 3 cloves garlic, minced 1 teaspoon crushed red pepper flakes, optional 1/2 cup freshly grated Parmesan cheese Kosher salt and freshly ground black pepper, to taste 2 tablespoons chopped fresh parsley leaves