This recipe is as easy as making a box of macaroni and cheese (almost), and it's a one dish comfort meal. I've been making this as long as I can remember, and don't think I ever had a recipe for it. When I made it this week, I looked to see if it was posted, and I could only find recipes with "cream of whatever" soup or sour cream, and most of them required baking in the oven. This recipe is creamy and delicious from the simple bechamel (white) sauce. This is a flexible recipe, too. I love to use a generous amount of a mixed pepper blend, freshly ground, for seasoning because I don't like bland food. I've also used lemon pepper seasoning, and/or freshly snipped chives and parsley. It's up to you to choose your favorite seasoning or herbs to go nicely with the tuna. Tuna noodle casserole is one of the most popular American casseroles, and is common is any region of the U.S.