Step 4
Prepare the sauce by melting butter over medium-low heat. Add garlic, cover, and cook until softened but not browned, about 5 minutes. Pour in Marsala wine and cook for 5 minutes. Stir in heavy cream, Parmesan cheese, milk, chicken broth, cornstarch, mustard, rosemary, thyme, salt, and cayenne pepper. Bring sauce to a simmer and cook, stirring occasionally, until flavors combine, about 10 minutes.