1/2 bag noodles (cooked according to directions)
1 c. shredded American cheese
2 cans cream of mushroom soup
1 chopped onion
2 cans drained tuna (2 c. chicken or turkey may be substituted)
Cracker crumbs to cover top, optional

Combine noodles, cheese, mushroom soup and onion in large casserole dish and microwave for 2 minute intervals 2 times. Add tuna and mix. Cover with cracker crumbs, if desired. Bake at 350 degrees for 45 minutes.