Preheat oven to 350 degrees F (175 degrees C).
Arrange Chicken on baking dish (spray lightly with PAM), Sprinkle with Italian seasoning and top with Parm Cheese (heaping amount).
In medium skillet, add butter until melted, stir in flour, then add milk all at once. Simmer, stirring, until bubbly. Stir in drained spinach mix together. Spoon spinach mixture over chicken and sprinkle with remaining cheese mixture. Bake uncovered for 30 to 35 minutes or until tender and chicken juices run clear.