Pasta: For a healthier version, use whole wheat spaghetti.
Turkey Tetrazzini: Sub cooked leftover turkey if you want.
Make Ahead Instructions: Sauté the vegetables and cook the sauce. Store the sauce and cooked pasta separately in the fridge, and then combine when ready to bake.
Freezing Instructions: The compiled casserole may be frozen for up to 3 months, but it wont be very “saucy” after baking, since the pasta will have soaked up some of the sauce. Thaw completely before baking.