1/4 cup butter
1/4 cup flour
2/3 cup chicken broth
1/2 cup half-and-half or 1/2 cup light cream
1/2 cup sour cream
1 cup parmesan cheese, grated
1/4 cup dry white wine, apple juice or 1/4 cup white grape juice
1 -2 garlic clove, minced
1 teaspoon lemon juice
1/2 teaspoon dry mustard
salt and pepper, to taste
3 cups cooked chicken breasts, cubed
8 ounces cooked spaghetti
2 teaspoons paprika
extra parmesan cheese
chopped fresh parsley

1  Melt butter in a saucepan and add flour stirring constantly.
2  When mixture thickens, add chicken broth, half and half, sour cream, Parmesan cheese, wine, garlic, lemon juice, dry mustard and salt and pepper.
3  Stir over medium heat until mixture again starts to thicken.
4  Add chicken and spaghetti noodles and stir well.
5  Place in a baking dish and sprinkle with paprika and extra Parmesan cheese.
6  Bake for 30 minutes at 350°.
7  Sprinkle with parsley and serve.

source:     http://www.food.com/recipe/chicken-spaghetti-99423