I found this off of allrecipes.com. I improvised a little (as I do with all my recipes). Here's what it turned out as:
1 box elbow pasta
2 cans cream of chicken soup (only because I was too pregnant to reach the cream of mushroom)
2 5 oz cans of tuna in water
Cheddar cheese (about 2 cups)
French fried onions (about 1.5 cups)
1. Cook pasta until al dente. Mix pasta, soup and tuna. Put in casserole dish. Top with cheddar cheese. Bake at 350 for 25 minutes.
2. Top with french fried onions. Back for an additional 5 minutes.