01 - 
                In your slow cooker, combine the heavy cream, chicken broth, Parmesan cheese, minced garlic, salt, pepper, and nutmeg. Stir until well mixed.
              
              
              
                02 - 
                Add the butter and diced chicken, if using, to the mixture.
              
              
              
                03 - 
                Break the fettuccine in half and add it to the slow cooker, making sure it is submerged in the liquid.
              
              
              
                04 - 
                Cover and cook on low for 2-3 hours, stirring occasionally, until the pasta is tender and the sauce is creamy.
              
              
              
                05 - 
                Once cooked, give it a good stir to ensure the pasta is well coated with the sauce. Serve hot, garnished with fresh parsley.