By Robin from Washington, IA
Prepare dressing as directed on box. Make sauce (with all ingredients EXCEPT mayonnaise), when bubbly - add mayonnaise and blend well.
Cook broccoli in boiling salted water until tender; drain. Arrange in 8x8 inch glass baking dish for flowerets facing outward. Place chicken on top
Mix all soup and broth together and place a little sauce on bottom of greased baking dish. Place chicken on sauce, then broccoli and mushrooms.