In a large saucepan, cook the spaghetti according to the package directions; drain. Stir in 1 tablespoon of the butter until the butter is melted; set aside.
Preheat the oven to broil.
In a 3-quart saucepan, melt 2 tablespoons of butter;
stir in the flour, salt, paprika, celery salt, and
pepper. Remove from the heat; gradually stir in milk
and stock. Cook over medium heat, stirring constantly,
until thickened. Add the chicken or turkey, mushrooms,
pimiento, spaghetti, and 1/4 cup of the cheese; heat
thoroughly. Place the mixture on an ovenproof platter
or shallow casserole; sprinkle the remaining 1/2 cup
of cheese over the top. Broil about 3 inches from the
heat until lightly browned. Servings: 8