1Heat oven to 350°F. Spray 8-inch square (2-quart) glass baking dish with cooking spray.
2Layer broccoli and turkey in baking dish. In medium bowl, mix soup, mayonnaise and milk; stir in cheese. Spread over turkey and broccoli.
3Cover baking dish with foil. Bake 30 minutes. Sprinkle with onions. Bake uncovered 20 to 25 minutes longer or until bubbly and broccoli is tender.