Microwave tuna mornay is a quick and easy dish that can be prepared in the microwave. It is a creamy and cheesy tuna casserole that is perfect for a weeknight dinner. The dish is made by combining cooked pasta, canned tuna, and a creamy cheese sauce. It is then microwaved until the cheese is melted and bubbly. Serve this comforting dish with a side salad for a complete meal.