Chicken-Broccoli Casserole

4 chicken breast (8 pcs.)
3 packages broccoli, cooked
3/4 cup parmesan cheese

Sauce:
6 tablespoons butter
3 cups chicken stock
6 tablespoons of flower
1 teaspoon salt
3 or 4 tablespoons sherry
1/2/ teaspoon pepper

Melt butter: add flour to make paste. Add stock slowly. Add sherry, salt, and pepper. Cook only until it begins to thicken. Place chicken and broccoli in casserole alternately. Add sauce. Sprinkle with parmesan cheese and bake 15 minutes at 425. Serves 8.