Rinse broccoli with hot water until thawed.
Butter 9x13 inch dish.
Put a small amount of sauce in bottom to keep noodles from sticking. Layer noodles, sauce, Mozzarella cheese, and chicken. Top with noodles and sauce. Reserve some Mozzarella cheese for last 15 minutes of cooking.
Bake for 1/2 hour at 350 degrees. Top with cheese and bake for 15 minutes more.