1 med. onion
1 can diced Rotel tomatoes
2 cans white chicken
1 lb. Velveeta cheese
1 (12 oz.) pkg. spaghetti

Cook spaghetti according to directions on package. Saute onion in oil. Add Rotel tomatoes, chicken, and Velveeta cheese. Cook over low heat until cheese is melted and mixture is hot. Pour over spaghetti and serve.