Here's a super easy one. Not really a casserole, you can do it all in one pot. I leave out the pimentos.
CHICKEN SPAGHETTI
1 lb cooked spaghetti (Use chicken bouillon cubes in the water – don't drain)
1 lb cubed Velveeta cheese
1 can cream of mushroom soup or cream of celery
Pimento
3 cans chicken (or one fryer cooked and cut up)
Cook spaghetti. Don’t drain. Add soup, cheese, then chicken and pimentos. Stir well. Will thicken on standing. Freezes well.