Adri's Chicken Tetrazzini

My good friend, Adri made this one night when the boys and I visited. She was kind enough to share the recipe so I could make it again at home. Sooooo good!
7 oz spaghetti, broken into thirds
1/4 cup butter
1/4 cup flour
1/2 teaspoon salt
1/4 teaspoon pepper
1 cup chicken broth
1 cup heavy whipping cream
2 tablespoons water
2 cups cubed cooked chicken or turkey
1/2 cup grated parmesan cheese

Preheat oven to 350
Boil and drain spaghetti
In 2 quart sauce pan, melt butter over low heat. Stir in flour, salt and pepper. Cook, stirring constantly, until mixture is smooth and bubbly; remove from heat. Stir in broth and whipping cream. Heat to boiling, stirring constantly. Boil and stir 1 minute
Stir spaghetti, water, and chicken into sauce. Pour spaghetti mixture into ungreased 2-quart casserole dish. Sprinkle with cheese.
Bake uncovered for about 30 min or until bubbly in the center.