Whisk together soup and milk in large mixing bowl; whisk in Alfredo sauce. Stir in chopped turkey, next 4 ingredients, and 1/2 cup Parmesan cheese. Pour into a lightly greased 15- x 10-inch baking dish.
Stir together remaining Parmesan cheese, crushed croutons, and paprika; sprinkle evenly over casserole.
Bake, covered, at 375° for 30 minutes. Uncover, and bake 15 more minutes or until golden brown and bubbly. Let stand 10 minutes before serving.
Note: Casserole may be assembled and frozen up to 1 month. Thaw in the refrigerator overnight; bake, covered, at 350° for 40 minutes. Uncover and bake 15 more minutes or until cheese is melted and bubbly. If you prefer a smaller casserole, use 2 (11- x 7-inch) baking dishes. Proceed as directed.