Add everything except the Parmesan to a 9x13 baking dish or casserole dish. Stir. If you prefer to save space in your freezer, you can add it to a large resealable freezer bag and squish it to combine.
Top with the Parmesan.
Cover with two layers of aluminum foil, one that is directly on top of the pasta so there isn't as much air in the container.
Bake at 375° for 30-40 minutes or one hour if still frozen. If frozen, remove foil for the last 10 minutes of bake time.
*examples of mix-in options: cooked cubed chicken and 2 Tbsp. of pesto, sliced mushrooms and frozen peas, crumbled bacon and sundried tomatoes, sundried tomatoes and artichoke hearts