Preheat the oven to 350 degrees Fahrenheit. Spread ⅓ of the 3 cups Alfredo sauce on the bottom of a 9 x 13-inch baking dish.
Layer half of the 1 (24-ounce) bag frozen ravioli over the sauce.
Add half of the 3 cups cooked chicken. Sprinkle with half of the 2 teaspoons Italian seasoning. Drizzle another ⅓ of the 3 cups Alfredo sauce over the chicken.
Layer the remaining half of the 1 (24-ounce) bag frozen ravioli over the sauce.
Top with the remaining half of the 3 cups cooked chicken. Sprinkle the remaining half of the 2 teaspoons Italian seasoning over the chicken. Top with the remaining ⅓ of the 3 cups Alfredo sauce.
Cover the top with 2 cups mozzarella cheese and 1 cup Parmesan cheese. Cover with foil and bake for 30 minutes. Uncover and bake for an additional 5-10 minutes, until the top is golden and bubbly.
Notes
Storage & Make Ahead Instructions
Refrigerator: Store leftovers in an airtight container in the fridge for up to 5 days. Reheat in the microwave or in the oven at 300 degrees until heated through.
Freeze: Store leftovers in a freezer-safe airtight container for up to 3 months. Thaw in the fridge overnight, then reheat.
Make Ahead: Assemble the casserole and cover with foil. Store in the fridge for up to 24 hours until ready to bake.