Season 1 lb. crabmeat with Cajun spice blend of your choice.
Melt 1 stick butter and saute 1/2 cup chopped onion, 1/2 cup chopped bell pepper, and 1/2 cup chopped celery. Add 1 lb. Velveeta cheese and cook until melted. Add 1 pt. half and half. Add cream of mushroom soup, 1 bunch chopped green onions, 1 tsp. chopped parsley, and salt to taste.
Cook spaghetti in salted water and drain. Put spaghetti in a large bowl. Add crabmeat and mixture and mix everything together.
Pour in baking dish and bake at 325 degrees for 30 to 40 minutes.