Mornay sauce is a rich and decadent sauce that is typically made with a bechamel base and Gruyere cheese. However, if you're looking to switch things up or add a different twist to your dishes, there are plenty of synonyms for Mornay sauce that you can experiment with. Some popular variations include adding different cheeses such as cheddar, Parmesan, or blue cheese, as well as herbs and spices like thyme or nutmeg. You could also try adding additional liquids like white wine or truffle oil to create a unique and flavorful sauce. Regardless of the variations you choose, Mornay sauce is a versatile and delicious accompaniment to a wide range of dishes.