Assemble casserole as directed. Refrigerate up to 24 hours. When ready to serve, bake as directed, increasing the first baking time to 40 to 45 min. or until casserole is heated through. Top with mozzarella; continue as directed.
Make it Easy
If using foil to cover the casserole, spray foil with cooking spray before using. Place, sprayed-side down, over casserole to prevent sticking.