Remove plastic lid from the tray of chicken alfredo.
Pour the Newman's Own Alfredo sauce evenly across the tray and stir lightly to mix (If Using, Optional)
Scatter the diced sun dried tomatoes across the top of the tray (If Using, Optional)
Cover the tray tightly with aluminum foil.
Place the tray onto a baking sheet.
Put the baking sheet with the tray into a 400F oven and bake for 50 minutes.
Remove the aluminum foil from he tray and bake for 15 more minutes.
Remove the alfredo from the oven and allow to cool for 5 minutes.
Serve the chicken alfredo, topping with additional grated Parmesan cheese as desired, along with sides of choice such as a salad, garlic bread or steamed broccoli.