JenniferS posted this one awhile back and it was yummy and easy!

Macaroni Tuna Casserole [Post #1]
Ingredients:
1 package (7 1/4 ounces) macaroni and cheese
1 can (10 3/4 ounces) condensed cream of celery soup, undiluted
1 can (6 ounces) tuna, drained and flaked
1/2 cup milk
1 cup (4 ounces) shredded cheddar cheese
Prepare macaroni and cheese according to package directions. Stir in soup, tuna and milk. Pour into a greased 2- quart baking dish. Sprinkle with cheese. Bake, uncovered, at 350 degrees for 20 minutes or until cheese is melted.
Yield: 4 servings
I double this recipe because I have to feed a family of five. When I double the recipe I use a family size box of macaroni and cheese, one can of cream of mushroom soup, one can of cream of celery soup and a 7.06 ounce envelope of tuna. I double all the other ingredients. My picky kids don't even realize there is tuna in it.
Tara posted this one and DH and I loved it..
Cheeseburger-and-Fries Casserole [Post #1]
2 pounds lean ground beef
1 10-3/4-ounce can condensed golden mushroom soup
1 10-3/4-ounce can condensed cheddar cheese soup
1 20-ounce package frozen, fried crinkle-cut potatoes
Hamburger toppings (choose from catsup, pickles, mustard and chopped tomato)
1. In a large skillet, cook the ground beef, half at a time, until brown. Drain off fat. Place the cooked meat in the bottom of a 13x9x2-inch baking dish.
2. In a medium mixing bowl, combine the condensed golden mushroom soup and the condensed cheddar cheese soup. Spread over the meat in the casserole.
3. Sprinkle the frozen crinkle-cut potatoes over the top of the casserole.
4. Bake in a 350 degree F. oven for 45 to 55 minutes or until the fries are golden. Garnish with suggested hamburger toppings, if you like. Makes 8 to 10 servings.
Source: Better Homes and Gardens